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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Tobias Klauser](/assets/img/avatar_default.png)
The do_idr_lock parameter to bpf_map_free_id was introduced by commitbd5f5f4ecb
("bpf: Add BPF_MAP_GET_FD_BY_ID"). However, all callers set do_idr_lock = true since commit1e0bd5a091
("bpf: Switch bpf_map ref counter to atomic64_t so bpf_map_inc() never fails"). While at it also inline __bpf_map_put into its only caller bpf_map_put now that do_idr_lock can be dropped from its signature. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Link: https://lore.kernel.org/r/20230202141921.4424-1-tklauser@distanz.ch Signed-off-by: Alexei Starovoitov <ast@kernel.org>
856 lines
20 KiB
C
856 lines
20 KiB
C
/*
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* Copyright (C) 2017-2018 Netronome Systems, Inc.
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*
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* This software is licensed under the GNU General License Version 2,
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* June 1991 as shown in the file COPYING in the top-level directory of this
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* source tree.
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*
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* THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
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* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
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* OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
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* THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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*/
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#include <linux/bpf.h>
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#include <linux/bpf_verifier.h>
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#include <linux/bug.h>
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#include <linux/kdev_t.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/netdevice.h>
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#include <linux/printk.h>
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#include <linux/proc_ns.h>
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#include <linux/rhashtable.h>
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#include <linux/rtnetlink.h>
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#include <linux/rwsem.h>
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/* Protects offdevs, members of bpf_offload_netdev and offload members
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* of all progs.
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* RTNL lock cannot be taken when holding this lock.
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*/
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static DECLARE_RWSEM(bpf_devs_lock);
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struct bpf_offload_dev {
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const struct bpf_prog_offload_ops *ops;
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struct list_head netdevs;
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void *priv;
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};
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struct bpf_offload_netdev {
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struct rhash_head l;
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struct net_device *netdev;
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struct bpf_offload_dev *offdev; /* NULL when bound-only */
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struct list_head progs;
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struct list_head maps;
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struct list_head offdev_netdevs;
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};
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static const struct rhashtable_params offdevs_params = {
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.nelem_hint = 4,
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.key_len = sizeof(struct net_device *),
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.key_offset = offsetof(struct bpf_offload_netdev, netdev),
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.head_offset = offsetof(struct bpf_offload_netdev, l),
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.automatic_shrinking = true,
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};
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static struct rhashtable offdevs;
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static int bpf_dev_offload_check(struct net_device *netdev)
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{
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if (!netdev)
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return -EINVAL;
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if (!netdev->netdev_ops->ndo_bpf)
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return -EOPNOTSUPP;
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return 0;
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}
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static struct bpf_offload_netdev *
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bpf_offload_find_netdev(struct net_device *netdev)
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{
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lockdep_assert_held(&bpf_devs_lock);
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return rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params);
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}
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static int __bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
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struct net_device *netdev)
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{
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struct bpf_offload_netdev *ondev;
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int err;
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ondev = kzalloc(sizeof(*ondev), GFP_KERNEL);
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if (!ondev)
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return -ENOMEM;
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ondev->netdev = netdev;
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ondev->offdev = offdev;
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INIT_LIST_HEAD(&ondev->progs);
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INIT_LIST_HEAD(&ondev->maps);
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err = rhashtable_insert_fast(&offdevs, &ondev->l, offdevs_params);
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if (err) {
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netdev_warn(netdev, "failed to register for BPF offload\n");
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goto err_free;
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}
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if (offdev)
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list_add(&ondev->offdev_netdevs, &offdev->netdevs);
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return 0;
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err_free:
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kfree(ondev);
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return err;
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}
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static void __bpf_prog_offload_destroy(struct bpf_prog *prog)
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{
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struct bpf_prog_offload *offload = prog->aux->offload;
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if (offload->dev_state)
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offload->offdev->ops->destroy(prog);
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list_del_init(&offload->offloads);
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kfree(offload);
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prog->aux->offload = NULL;
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}
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static int bpf_map_offload_ndo(struct bpf_offloaded_map *offmap,
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enum bpf_netdev_command cmd)
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{
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struct netdev_bpf data = {};
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struct net_device *netdev;
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ASSERT_RTNL();
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data.command = cmd;
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data.offmap = offmap;
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/* Caller must make sure netdev is valid */
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netdev = offmap->netdev;
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return netdev->netdev_ops->ndo_bpf(netdev, &data);
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}
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static void __bpf_map_offload_destroy(struct bpf_offloaded_map *offmap)
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{
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WARN_ON(bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_FREE));
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/* Make sure BPF_MAP_GET_NEXT_ID can't find this dead map */
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bpf_map_free_id(&offmap->map);
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list_del_init(&offmap->offloads);
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offmap->netdev = NULL;
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}
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static void __bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
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struct net_device *netdev)
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{
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struct bpf_offload_netdev *ondev, *altdev = NULL;
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struct bpf_offloaded_map *offmap, *mtmp;
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struct bpf_prog_offload *offload, *ptmp;
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ASSERT_RTNL();
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ondev = rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params);
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if (WARN_ON(!ondev))
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return;
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WARN_ON(rhashtable_remove_fast(&offdevs, &ondev->l, offdevs_params));
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/* Try to move the objects to another netdev of the device */
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if (offdev) {
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list_del(&ondev->offdev_netdevs);
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altdev = list_first_entry_or_null(&offdev->netdevs,
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struct bpf_offload_netdev,
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offdev_netdevs);
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}
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if (altdev) {
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list_for_each_entry(offload, &ondev->progs, offloads)
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offload->netdev = altdev->netdev;
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list_splice_init(&ondev->progs, &altdev->progs);
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list_for_each_entry(offmap, &ondev->maps, offloads)
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offmap->netdev = altdev->netdev;
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list_splice_init(&ondev->maps, &altdev->maps);
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} else {
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list_for_each_entry_safe(offload, ptmp, &ondev->progs, offloads)
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__bpf_prog_offload_destroy(offload->prog);
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list_for_each_entry_safe(offmap, mtmp, &ondev->maps, offloads)
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__bpf_map_offload_destroy(offmap);
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}
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WARN_ON(!list_empty(&ondev->progs));
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WARN_ON(!list_empty(&ondev->maps));
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kfree(ondev);
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}
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static int __bpf_prog_dev_bound_init(struct bpf_prog *prog, struct net_device *netdev)
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{
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struct bpf_offload_netdev *ondev;
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struct bpf_prog_offload *offload;
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int err;
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offload = kzalloc(sizeof(*offload), GFP_USER);
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if (!offload)
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return -ENOMEM;
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offload->prog = prog;
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offload->netdev = netdev;
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ondev = bpf_offload_find_netdev(offload->netdev);
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if (!ondev) {
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if (bpf_prog_is_offloaded(prog->aux)) {
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err = -EINVAL;
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goto err_free;
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}
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/* When only binding to the device, explicitly
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* create an entry in the hashtable.
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*/
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err = __bpf_offload_dev_netdev_register(NULL, offload->netdev);
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if (err)
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goto err_free;
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ondev = bpf_offload_find_netdev(offload->netdev);
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}
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offload->offdev = ondev->offdev;
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prog->aux->offload = offload;
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list_add_tail(&offload->offloads, &ondev->progs);
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return 0;
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err_free:
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kfree(offload);
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return err;
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}
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int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr)
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{
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struct net_device *netdev;
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int err;
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if (attr->prog_type != BPF_PROG_TYPE_SCHED_CLS &&
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attr->prog_type != BPF_PROG_TYPE_XDP)
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return -EINVAL;
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if (attr->prog_flags & ~BPF_F_XDP_DEV_BOUND_ONLY)
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return -EINVAL;
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if (attr->prog_type == BPF_PROG_TYPE_SCHED_CLS &&
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attr->prog_flags & BPF_F_XDP_DEV_BOUND_ONLY)
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return -EINVAL;
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netdev = dev_get_by_index(current->nsproxy->net_ns, attr->prog_ifindex);
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if (!netdev)
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return -EINVAL;
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err = bpf_dev_offload_check(netdev);
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if (err)
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goto out;
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prog->aux->offload_requested = !(attr->prog_flags & BPF_F_XDP_DEV_BOUND_ONLY);
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down_write(&bpf_devs_lock);
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err = __bpf_prog_dev_bound_init(prog, netdev);
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up_write(&bpf_devs_lock);
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out:
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dev_put(netdev);
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return err;
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}
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int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog)
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{
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int err;
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if (!bpf_prog_is_dev_bound(old_prog->aux))
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return 0;
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if (bpf_prog_is_offloaded(old_prog->aux))
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return -EINVAL;
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new_prog->aux->dev_bound = old_prog->aux->dev_bound;
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new_prog->aux->offload_requested = old_prog->aux->offload_requested;
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down_write(&bpf_devs_lock);
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if (!old_prog->aux->offload) {
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err = -EINVAL;
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goto out;
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}
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err = __bpf_prog_dev_bound_init(new_prog, old_prog->aux->offload->netdev);
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out:
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up_write(&bpf_devs_lock);
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return err;
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}
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int bpf_prog_offload_verifier_prep(struct bpf_prog *prog)
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{
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struct bpf_prog_offload *offload;
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int ret = -ENODEV;
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down_read(&bpf_devs_lock);
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offload = prog->aux->offload;
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if (offload) {
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ret = offload->offdev->ops->prepare(prog);
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offload->dev_state = !ret;
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}
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up_read(&bpf_devs_lock);
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return ret;
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}
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int bpf_prog_offload_verify_insn(struct bpf_verifier_env *env,
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int insn_idx, int prev_insn_idx)
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{
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struct bpf_prog_offload *offload;
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int ret = -ENODEV;
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down_read(&bpf_devs_lock);
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offload = env->prog->aux->offload;
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if (offload)
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ret = offload->offdev->ops->insn_hook(env, insn_idx,
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prev_insn_idx);
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up_read(&bpf_devs_lock);
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return ret;
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}
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int bpf_prog_offload_finalize(struct bpf_verifier_env *env)
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{
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struct bpf_prog_offload *offload;
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int ret = -ENODEV;
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down_read(&bpf_devs_lock);
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offload = env->prog->aux->offload;
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if (offload) {
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if (offload->offdev->ops->finalize)
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ret = offload->offdev->ops->finalize(env);
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else
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ret = 0;
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}
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up_read(&bpf_devs_lock);
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return ret;
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}
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void
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bpf_prog_offload_replace_insn(struct bpf_verifier_env *env, u32 off,
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struct bpf_insn *insn)
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{
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const struct bpf_prog_offload_ops *ops;
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struct bpf_prog_offload *offload;
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int ret = -EOPNOTSUPP;
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down_read(&bpf_devs_lock);
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offload = env->prog->aux->offload;
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if (offload) {
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ops = offload->offdev->ops;
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if (!offload->opt_failed && ops->replace_insn)
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ret = ops->replace_insn(env, off, insn);
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offload->opt_failed |= ret;
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}
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up_read(&bpf_devs_lock);
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}
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void
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bpf_prog_offload_remove_insns(struct bpf_verifier_env *env, u32 off, u32 cnt)
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{
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struct bpf_prog_offload *offload;
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int ret = -EOPNOTSUPP;
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down_read(&bpf_devs_lock);
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offload = env->prog->aux->offload;
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if (offload) {
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if (!offload->opt_failed && offload->offdev->ops->remove_insns)
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ret = offload->offdev->ops->remove_insns(env, off, cnt);
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offload->opt_failed |= ret;
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}
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up_read(&bpf_devs_lock);
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}
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void bpf_prog_dev_bound_destroy(struct bpf_prog *prog)
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{
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struct bpf_offload_netdev *ondev;
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struct net_device *netdev;
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rtnl_lock();
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down_write(&bpf_devs_lock);
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if (prog->aux->offload) {
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list_del_init(&prog->aux->offload->offloads);
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netdev = prog->aux->offload->netdev;
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__bpf_prog_offload_destroy(prog);
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ondev = bpf_offload_find_netdev(netdev);
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if (!ondev->offdev && list_empty(&ondev->progs))
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__bpf_offload_dev_netdev_unregister(NULL, netdev);
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}
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up_write(&bpf_devs_lock);
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rtnl_unlock();
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}
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static int bpf_prog_offload_translate(struct bpf_prog *prog)
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{
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struct bpf_prog_offload *offload;
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int ret = -ENODEV;
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down_read(&bpf_devs_lock);
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offload = prog->aux->offload;
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if (offload)
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ret = offload->offdev->ops->translate(prog);
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up_read(&bpf_devs_lock);
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return ret;
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}
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static unsigned int bpf_prog_warn_on_exec(const void *ctx,
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const struct bpf_insn *insn)
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{
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WARN(1, "attempt to execute device eBPF program on the host!");
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return 0;
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}
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int bpf_prog_offload_compile(struct bpf_prog *prog)
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{
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prog->bpf_func = bpf_prog_warn_on_exec;
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return bpf_prog_offload_translate(prog);
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}
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struct ns_get_path_bpf_prog_args {
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struct bpf_prog *prog;
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struct bpf_prog_info *info;
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};
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static struct ns_common *bpf_prog_offload_info_fill_ns(void *private_data)
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{
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struct ns_get_path_bpf_prog_args *args = private_data;
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struct bpf_prog_aux *aux = args->prog->aux;
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struct ns_common *ns;
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struct net *net;
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rtnl_lock();
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down_read(&bpf_devs_lock);
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if (aux->offload) {
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args->info->ifindex = aux->offload->netdev->ifindex;
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net = dev_net(aux->offload->netdev);
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get_net(net);
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ns = &net->ns;
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} else {
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args->info->ifindex = 0;
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ns = NULL;
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}
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up_read(&bpf_devs_lock);
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rtnl_unlock();
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return ns;
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}
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int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
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struct bpf_prog *prog)
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{
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struct ns_get_path_bpf_prog_args args = {
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.prog = prog,
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.info = info,
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};
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struct bpf_prog_aux *aux = prog->aux;
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struct inode *ns_inode;
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struct path ns_path;
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char __user *uinsns;
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int res;
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u32 ulen;
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res = ns_get_path_cb(&ns_path, bpf_prog_offload_info_fill_ns, &args);
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if (res) {
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if (!info->ifindex)
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return -ENODEV;
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return res;
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}
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down_read(&bpf_devs_lock);
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if (!aux->offload) {
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up_read(&bpf_devs_lock);
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return -ENODEV;
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}
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ulen = info->jited_prog_len;
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info->jited_prog_len = aux->offload->jited_len;
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if (info->jited_prog_len && ulen) {
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uinsns = u64_to_user_ptr(info->jited_prog_insns);
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ulen = min_t(u32, info->jited_prog_len, ulen);
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if (copy_to_user(uinsns, aux->offload->jited_image, ulen)) {
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up_read(&bpf_devs_lock);
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return -EFAULT;
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}
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}
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up_read(&bpf_devs_lock);
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|
|
ns_inode = ns_path.dentry->d_inode;
|
|
info->netns_dev = new_encode_dev(ns_inode->i_sb->s_dev);
|
|
info->netns_ino = ns_inode->i_ino;
|
|
path_put(&ns_path);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct bpf_prog_ops bpf_offload_prog_ops = {
|
|
};
|
|
|
|
struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
|
|
{
|
|
struct net *net = current->nsproxy->net_ns;
|
|
struct bpf_offload_netdev *ondev;
|
|
struct bpf_offloaded_map *offmap;
|
|
int err;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return ERR_PTR(-EPERM);
|
|
if (attr->map_type != BPF_MAP_TYPE_ARRAY &&
|
|
attr->map_type != BPF_MAP_TYPE_HASH)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
offmap = bpf_map_area_alloc(sizeof(*offmap), NUMA_NO_NODE);
|
|
if (!offmap)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
bpf_map_init_from_attr(&offmap->map, attr);
|
|
|
|
rtnl_lock();
|
|
down_write(&bpf_devs_lock);
|
|
offmap->netdev = __dev_get_by_index(net, attr->map_ifindex);
|
|
err = bpf_dev_offload_check(offmap->netdev);
|
|
if (err)
|
|
goto err_unlock;
|
|
|
|
ondev = bpf_offload_find_netdev(offmap->netdev);
|
|
if (!ondev) {
|
|
err = -EINVAL;
|
|
goto err_unlock;
|
|
}
|
|
|
|
err = bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_ALLOC);
|
|
if (err)
|
|
goto err_unlock;
|
|
|
|
list_add_tail(&offmap->offloads, &ondev->maps);
|
|
up_write(&bpf_devs_lock);
|
|
rtnl_unlock();
|
|
|
|
return &offmap->map;
|
|
|
|
err_unlock:
|
|
up_write(&bpf_devs_lock);
|
|
rtnl_unlock();
|
|
bpf_map_area_free(offmap);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
void bpf_map_offload_map_free(struct bpf_map *map)
|
|
{
|
|
struct bpf_offloaded_map *offmap = map_to_offmap(map);
|
|
|
|
rtnl_lock();
|
|
down_write(&bpf_devs_lock);
|
|
if (offmap->netdev)
|
|
__bpf_map_offload_destroy(offmap);
|
|
up_write(&bpf_devs_lock);
|
|
rtnl_unlock();
|
|
|
|
bpf_map_area_free(offmap);
|
|
}
|
|
|
|
int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value)
|
|
{
|
|
struct bpf_offloaded_map *offmap = map_to_offmap(map);
|
|
int ret = -ENODEV;
|
|
|
|
down_read(&bpf_devs_lock);
|
|
if (offmap->netdev)
|
|
ret = offmap->dev_ops->map_lookup_elem(offmap, key, value);
|
|
up_read(&bpf_devs_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int bpf_map_offload_update_elem(struct bpf_map *map,
|
|
void *key, void *value, u64 flags)
|
|
{
|
|
struct bpf_offloaded_map *offmap = map_to_offmap(map);
|
|
int ret = -ENODEV;
|
|
|
|
if (unlikely(flags > BPF_EXIST))
|
|
return -EINVAL;
|
|
|
|
down_read(&bpf_devs_lock);
|
|
if (offmap->netdev)
|
|
ret = offmap->dev_ops->map_update_elem(offmap, key, value,
|
|
flags);
|
|
up_read(&bpf_devs_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int bpf_map_offload_delete_elem(struct bpf_map *map, void *key)
|
|
{
|
|
struct bpf_offloaded_map *offmap = map_to_offmap(map);
|
|
int ret = -ENODEV;
|
|
|
|
down_read(&bpf_devs_lock);
|
|
if (offmap->netdev)
|
|
ret = offmap->dev_ops->map_delete_elem(offmap, key);
|
|
up_read(&bpf_devs_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int bpf_map_offload_get_next_key(struct bpf_map *map, void *key, void *next_key)
|
|
{
|
|
struct bpf_offloaded_map *offmap = map_to_offmap(map);
|
|
int ret = -ENODEV;
|
|
|
|
down_read(&bpf_devs_lock);
|
|
if (offmap->netdev)
|
|
ret = offmap->dev_ops->map_get_next_key(offmap, key, next_key);
|
|
up_read(&bpf_devs_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct ns_get_path_bpf_map_args {
|
|
struct bpf_offloaded_map *offmap;
|
|
struct bpf_map_info *info;
|
|
};
|
|
|
|
static struct ns_common *bpf_map_offload_info_fill_ns(void *private_data)
|
|
{
|
|
struct ns_get_path_bpf_map_args *args = private_data;
|
|
struct ns_common *ns;
|
|
struct net *net;
|
|
|
|
rtnl_lock();
|
|
down_read(&bpf_devs_lock);
|
|
|
|
if (args->offmap->netdev) {
|
|
args->info->ifindex = args->offmap->netdev->ifindex;
|
|
net = dev_net(args->offmap->netdev);
|
|
get_net(net);
|
|
ns = &net->ns;
|
|
} else {
|
|
args->info->ifindex = 0;
|
|
ns = NULL;
|
|
}
|
|
|
|
up_read(&bpf_devs_lock);
|
|
rtnl_unlock();
|
|
|
|
return ns;
|
|
}
|
|
|
|
int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map)
|
|
{
|
|
struct ns_get_path_bpf_map_args args = {
|
|
.offmap = map_to_offmap(map),
|
|
.info = info,
|
|
};
|
|
struct inode *ns_inode;
|
|
struct path ns_path;
|
|
int res;
|
|
|
|
res = ns_get_path_cb(&ns_path, bpf_map_offload_info_fill_ns, &args);
|
|
if (res) {
|
|
if (!info->ifindex)
|
|
return -ENODEV;
|
|
return res;
|
|
}
|
|
|
|
ns_inode = ns_path.dentry->d_inode;
|
|
info->netns_dev = new_encode_dev(ns_inode->i_sb->s_dev);
|
|
info->netns_ino = ns_inode->i_ino;
|
|
path_put(&ns_path);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool __bpf_offload_dev_match(struct bpf_prog *prog,
|
|
struct net_device *netdev)
|
|
{
|
|
struct bpf_offload_netdev *ondev1, *ondev2;
|
|
struct bpf_prog_offload *offload;
|
|
|
|
if (!bpf_prog_is_dev_bound(prog->aux))
|
|
return false;
|
|
|
|
offload = prog->aux->offload;
|
|
if (!offload)
|
|
return false;
|
|
if (offload->netdev == netdev)
|
|
return true;
|
|
|
|
ondev1 = bpf_offload_find_netdev(offload->netdev);
|
|
ondev2 = bpf_offload_find_netdev(netdev);
|
|
|
|
return ondev1 && ondev2 && ondev1->offdev == ondev2->offdev;
|
|
}
|
|
|
|
bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev)
|
|
{
|
|
bool ret;
|
|
|
|
down_read(&bpf_devs_lock);
|
|
ret = __bpf_offload_dev_match(prog, netdev);
|
|
up_read(&bpf_devs_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_offload_dev_match);
|
|
|
|
bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
|
|
{
|
|
bool ret;
|
|
|
|
if (bpf_prog_is_offloaded(lhs->aux) != bpf_prog_is_offloaded(rhs->aux))
|
|
return false;
|
|
|
|
down_read(&bpf_devs_lock);
|
|
ret = lhs->aux->offload && rhs->aux->offload &&
|
|
lhs->aux->offload->netdev &&
|
|
lhs->aux->offload->netdev == rhs->aux->offload->netdev;
|
|
up_read(&bpf_devs_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map)
|
|
{
|
|
struct bpf_offloaded_map *offmap;
|
|
bool ret;
|
|
|
|
if (!bpf_map_is_offloaded(map))
|
|
return bpf_map_offload_neutral(map);
|
|
offmap = map_to_offmap(map);
|
|
|
|
down_read(&bpf_devs_lock);
|
|
ret = __bpf_offload_dev_match(prog, offmap->netdev);
|
|
up_read(&bpf_devs_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
|
|
struct net_device *netdev)
|
|
{
|
|
int err;
|
|
|
|
down_write(&bpf_devs_lock);
|
|
err = __bpf_offload_dev_netdev_register(offdev, netdev);
|
|
up_write(&bpf_devs_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_register);
|
|
|
|
void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
|
|
struct net_device *netdev)
|
|
{
|
|
down_write(&bpf_devs_lock);
|
|
__bpf_offload_dev_netdev_unregister(offdev, netdev);
|
|
up_write(&bpf_devs_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_unregister);
|
|
|
|
struct bpf_offload_dev *
|
|
bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv)
|
|
{
|
|
struct bpf_offload_dev *offdev;
|
|
|
|
offdev = kzalloc(sizeof(*offdev), GFP_KERNEL);
|
|
if (!offdev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
offdev->ops = ops;
|
|
offdev->priv = priv;
|
|
INIT_LIST_HEAD(&offdev->netdevs);
|
|
|
|
return offdev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_offload_dev_create);
|
|
|
|
void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev)
|
|
{
|
|
WARN_ON(!list_empty(&offdev->netdevs));
|
|
kfree(offdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_offload_dev_destroy);
|
|
|
|
void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev)
|
|
{
|
|
return offdev->priv;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bpf_offload_dev_priv);
|
|
|
|
void bpf_dev_bound_netdev_unregister(struct net_device *dev)
|
|
{
|
|
struct bpf_offload_netdev *ondev;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
down_write(&bpf_devs_lock);
|
|
ondev = bpf_offload_find_netdev(dev);
|
|
if (ondev && !ondev->offdev)
|
|
__bpf_offload_dev_netdev_unregister(NULL, ondev->netdev);
|
|
up_write(&bpf_devs_lock);
|
|
}
|
|
|
|
int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
|
|
struct bpf_prog_aux *prog_aux)
|
|
{
|
|
if (!bpf_prog_is_dev_bound(prog_aux)) {
|
|
bpf_log(log, "metadata kfuncs require device-bound program\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (bpf_prog_is_offloaded(prog_aux)) {
|
|
bpf_log(log, "metadata kfuncs can't be offloaded\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
|
|
{
|
|
const struct xdp_metadata_ops *ops;
|
|
void *p = NULL;
|
|
|
|
/* We don't hold bpf_devs_lock while resolving several
|
|
* kfuncs and can race with the unregister_netdevice().
|
|
* We rely on bpf_dev_bound_match() check at attach
|
|
* to render this program unusable.
|
|
*/
|
|
down_read(&bpf_devs_lock);
|
|
if (!prog->aux->offload)
|
|
goto out;
|
|
|
|
ops = prog->aux->offload->netdev->xdp_metadata_ops;
|
|
if (!ops)
|
|
goto out;
|
|
|
|
if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_TIMESTAMP))
|
|
p = ops->xmo_rx_timestamp;
|
|
else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_HASH))
|
|
p = ops->xmo_rx_hash;
|
|
out:
|
|
up_read(&bpf_devs_lock);
|
|
|
|
return p;
|
|
}
|
|
|
|
static int __init bpf_offload_init(void)
|
|
{
|
|
return rhashtable_init(&offdevs, &offdevs_params);
|
|
}
|
|
|
|
late_initcall(bpf_offload_init);
|