2017-11-28 04:10:23 +08:00
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/*
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* Copyright (C) 2017 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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2017-11-04 04:56:17 +08:00
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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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2017-12-28 10:39:09 +08:00
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#include <linux/kdev_t.h>
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2017-11-04 04:56:17 +08:00
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/printk.h>
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2017-12-28 10:39:09 +08:00
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#include <linux/proc_ns.h>
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2017-11-04 04:56:17 +08:00
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#include <linux/rtnetlink.h>
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2017-12-28 10:39:03 +08:00
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#include <linux/rwsem.h>
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2017-11-04 04:56:17 +08:00
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2018-01-12 12:29:09 +08:00
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/* Protects bpf_prog_offload_devs, bpf_map_offload_devs and offload members
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* of all progs.
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2017-12-28 10:39:03 +08:00
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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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2017-11-04 04:56:17 +08:00
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static LIST_HEAD(bpf_prog_offload_devs);
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2018-01-12 12:29:09 +08:00
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static LIST_HEAD(bpf_map_offload_devs);
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2017-11-04 04:56:17 +08:00
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2018-01-12 12:29:08 +08:00
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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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2017-11-04 04:56:17 +08:00
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int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
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{
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2018-01-12 12:29:07 +08:00
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struct bpf_prog_offload *offload;
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2018-01-12 12:29:08 +08:00
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int err;
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2017-11-04 04:56:17 +08:00
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2017-11-21 07:21:52 +08:00
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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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2017-11-04 04:56:17 +08:00
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if (attr->prog_flags)
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return -EINVAL;
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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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2017-12-28 10:39:03 +08:00
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offload->netdev = dev_get_by_index(current->nsproxy->net_ns,
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attr->prog_ifindex);
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2018-01-12 12:29:08 +08:00
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err = bpf_dev_offload_check(offload->netdev);
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if (err)
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goto err_maybe_put;
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2017-11-04 04:56:17 +08:00
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2017-12-28 10:39:03 +08:00
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down_write(&bpf_devs_lock);
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2018-01-12 12:29:08 +08:00
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if (offload->netdev->reg_state != NETREG_REGISTERED) {
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err = -EINVAL;
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2017-12-28 10:39:03 +08:00
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goto err_unlock;
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2018-01-12 12:29:08 +08:00
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}
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2017-11-04 04:56:17 +08:00
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prog->aux->offload = offload;
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list_add_tail(&offload->offloads, &bpf_prog_offload_devs);
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2017-12-28 10:39:03 +08:00
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dev_put(offload->netdev);
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up_write(&bpf_devs_lock);
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2017-11-04 04:56:17 +08:00
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return 0;
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2017-12-28 10:39:03 +08:00
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err_unlock:
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up_write(&bpf_devs_lock);
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2018-01-12 12:29:08 +08:00
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err_maybe_put:
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if (offload->netdev)
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dev_put(offload->netdev);
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2017-12-28 10:39:03 +08:00
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kfree(offload);
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2018-01-12 12:29:08 +08:00
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return err;
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2017-11-04 04:56:17 +08:00
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}
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static int __bpf_offload_ndo(struct bpf_prog *prog, enum bpf_netdev_command cmd,
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struct netdev_bpf *data)
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{
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2018-01-12 12:29:07 +08:00
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struct bpf_prog_offload *offload = prog->aux->offload;
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2017-12-28 10:39:06 +08:00
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struct net_device *netdev;
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2017-11-04 04:56:17 +08:00
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ASSERT_RTNL();
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2017-12-28 10:39:06 +08:00
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if (!offload)
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2017-11-04 04:56:17 +08:00
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return -ENODEV;
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2017-12-28 10:39:06 +08:00
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netdev = offload->netdev;
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2017-11-04 04:56:17 +08:00
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data->command = cmd;
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return netdev->netdev_ops->ndo_bpf(netdev, data);
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}
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int bpf_prog_offload_verifier_prep(struct bpf_verifier_env *env)
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{
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struct netdev_bpf data = {};
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int err;
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data.verifier.prog = env->prog;
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rtnl_lock();
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err = __bpf_offload_ndo(env->prog, BPF_OFFLOAD_VERIFIER_PREP, &data);
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if (err)
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goto exit_unlock;
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2017-12-28 10:39:05 +08:00
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env->prog->aux->offload->dev_ops = data.verifier.ops;
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2017-11-04 04:56:17 +08:00
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env->prog->aux->offload->dev_state = true;
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exit_unlock:
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rtnl_unlock();
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return err;
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}
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2017-12-28 10:39:05 +08:00
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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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2018-01-12 12:29:07 +08:00
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struct bpf_prog_offload *offload;
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2017-12-28 10:39:05 +08:00
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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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2017-12-28 10:39:06 +08:00
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if (offload)
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2017-12-28 10:39:05 +08:00
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ret = offload->dev_ops->insn_hook(env, insn_idx, 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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2017-11-04 04:56:17 +08:00
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static void __bpf_prog_offload_destroy(struct bpf_prog *prog)
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{
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2018-01-12 12:29:07 +08:00
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struct bpf_prog_offload *offload = prog->aux->offload;
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2017-11-04 04:56:17 +08:00
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struct netdev_bpf data = {};
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data.offload.prog = prog;
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if (offload->dev_state)
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WARN_ON(__bpf_offload_ndo(prog, BPF_OFFLOAD_DESTROY, &data));
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2017-12-28 10:39:07 +08:00
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/* Make sure BPF_PROG_GET_NEXT_ID can't find this dead program */
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bpf_prog_free_id(prog, true);
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2017-11-04 04:56:17 +08:00
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list_del_init(&offload->offloads);
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2017-12-28 10:39:06 +08:00
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kfree(offload);
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prog->aux->offload = NULL;
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2017-11-04 04:56:17 +08:00
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}
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void bpf_prog_offload_destroy(struct bpf_prog *prog)
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{
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rtnl_lock();
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2017-12-28 10:39:03 +08:00
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down_write(&bpf_devs_lock);
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2017-12-28 10:39:06 +08:00
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if (prog->aux->offload)
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__bpf_prog_offload_destroy(prog);
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2017-12-28 10:39:03 +08:00
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up_write(&bpf_devs_lock);
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2017-11-04 04:56:17 +08:00
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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 netdev_bpf data = {};
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int ret;
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data.offload.prog = prog;
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rtnl_lock();
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ret = __bpf_offload_ndo(prog, BPF_OFFLOAD_TRANSLATE, &data);
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rtnl_unlock();
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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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2017-12-28 10:39:09 +08:00
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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 inode *ns_inode;
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struct path ns_path;
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void *res;
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res = ns_get_path_cb(&ns_path, bpf_prog_offload_info_fill_ns, &args);
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if (IS_ERR(res)) {
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if (!info->ifindex)
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return -ENODEV;
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return PTR_ERR(res);
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}
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ns_inode = ns_path.dentry->d_inode;
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info->netns_dev = new_encode_dev(ns_inode->i_sb->s_dev);
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info->netns_ino = ns_inode->i_ino;
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path_put(&ns_path);
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return 0;
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}
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2017-11-04 04:56:17 +08:00
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const struct bpf_prog_ops bpf_offload_prog_ops = {
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};
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2018-01-12 12:29:09 +08:00
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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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struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
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{
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struct net *net = current->nsproxy->net_ns;
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struct bpf_offloaded_map *offmap;
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int err;
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if (!capable(CAP_SYS_ADMIN))
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return ERR_PTR(-EPERM);
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if (attr->map_type != BPF_MAP_TYPE_HASH)
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return ERR_PTR(-EINVAL);
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offmap = kzalloc(sizeof(*offmap), GFP_USER);
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if (!offmap)
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return ERR_PTR(-ENOMEM);
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bpf_map_init_from_attr(&offmap->map, attr);
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rtnl_lock();
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down_write(&bpf_devs_lock);
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offmap->netdev = __dev_get_by_index(net, attr->map_ifindex);
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err = bpf_dev_offload_check(offmap->netdev);
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if (err)
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goto err_unlock;
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err = bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_ALLOC);
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if (err)
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goto err_unlock;
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list_add_tail(&offmap->offloads, &bpf_map_offload_devs);
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up_write(&bpf_devs_lock);
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rtnl_unlock();
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return &offmap->map;
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err_unlock:
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up_write(&bpf_devs_lock);
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rtnl_unlock();
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kfree(offmap);
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return ERR_PTR(err);
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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, true);
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list_del_init(&offmap->offloads);
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offmap->netdev = NULL;
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}
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void bpf_map_offload_map_free(struct bpf_map *map)
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{
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struct bpf_offloaded_map *offmap = map_to_offmap(map);
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rtnl_lock();
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down_write(&bpf_devs_lock);
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if (offmap->netdev)
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__bpf_map_offload_destroy(offmap);
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up_write(&bpf_devs_lock);
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|
rtnl_unlock();
|
|
|
|
|
|
|
|
kfree(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;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map)
|
|
|
|
{
|
|
|
|
struct bpf_offloaded_map *offmap;
|
|
|
|
struct bpf_prog_offload *offload;
|
|
|
|
bool ret;
|
|
|
|
|
2018-01-17 07:51:45 +08:00
|
|
|
if (!bpf_prog_is_dev_bound(prog->aux) || !bpf_map_is_dev_bound(map))
|
2018-01-12 12:29:09 +08:00
|
|
|
return false;
|
|
|
|
|
|
|
|
down_read(&bpf_devs_lock);
|
|
|
|
offload = prog->aux->offload;
|
|
|
|
offmap = map_to_offmap(map);
|
|
|
|
|
|
|
|
ret = offload && offload->netdev == offmap->netdev;
|
|
|
|
up_read(&bpf_devs_lock);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void bpf_offload_orphan_all_progs(struct net_device *netdev)
|
|
|
|
{
|
|
|
|
struct bpf_prog_offload *offload, *tmp;
|
|
|
|
|
|
|
|
list_for_each_entry_safe(offload, tmp, &bpf_prog_offload_devs, offloads)
|
|
|
|
if (offload->netdev == netdev)
|
|
|
|
__bpf_prog_offload_destroy(offload->prog);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void bpf_offload_orphan_all_maps(struct net_device *netdev)
|
|
|
|
{
|
|
|
|
struct bpf_offloaded_map *offmap, *tmp;
|
|
|
|
|
|
|
|
list_for_each_entry_safe(offmap, tmp, &bpf_map_offload_devs, offloads)
|
|
|
|
if (offmap->netdev == netdev)
|
|
|
|
__bpf_map_offload_destroy(offmap);
|
|
|
|
}
|
|
|
|
|
2017-11-04 04:56:17 +08:00
|
|
|
static int bpf_offload_notification(struct notifier_block *notifier,
|
|
|
|
ulong event, void *ptr)
|
|
|
|
{
|
|
|
|
struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
|
|
|
|
ASSERT_RTNL();
|
|
|
|
|
|
|
|
switch (event) {
|
|
|
|
case NETDEV_UNREGISTER:
|
2017-11-21 07:21:57 +08:00
|
|
|
/* ignore namespace changes */
|
|
|
|
if (netdev->reg_state != NETREG_UNREGISTERING)
|
|
|
|
break;
|
|
|
|
|
2017-12-28 10:39:03 +08:00
|
|
|
down_write(&bpf_devs_lock);
|
2018-01-12 12:29:09 +08:00
|
|
|
bpf_offload_orphan_all_progs(netdev);
|
|
|
|
bpf_offload_orphan_all_maps(netdev);
|
2017-12-28 10:39:03 +08:00
|
|
|
up_write(&bpf_devs_lock);
|
2017-11-04 04:56:17 +08:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block bpf_offload_notifier = {
|
|
|
|
.notifier_call = bpf_offload_notification,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init bpf_offload_init(void)
|
|
|
|
{
|
|
|
|
register_netdevice_notifier(&bpf_offload_notifier);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
subsys_initcall(bpf_offload_init);
|