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712 lines
16 KiB
712 lines
16 KiB
/* |
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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; |
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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 bool offdevs_inited; |
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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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if (!offdevs_inited) |
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return NULL; |
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return rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params); |
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} |
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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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struct bpf_offload_netdev *ondev; |
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struct bpf_prog_offload *offload; |
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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) |
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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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offload->netdev = dev_get_by_index(current->nsproxy->net_ns, |
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attr->prog_ifindex); |
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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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down_write(&bpf_devs_lock); |
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ondev = bpf_offload_find_netdev(offload->netdev); |
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if (!ondev) { |
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err = -EINVAL; |
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goto err_unlock; |
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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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dev_put(offload->netdev); |
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up_write(&bpf_devs_lock); |
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return 0; |
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err_unlock: |
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up_write(&bpf_devs_lock); |
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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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kfree(offload); |
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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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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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/* 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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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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void bpf_prog_offload_destroy(struct bpf_prog *prog) |
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{ |
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down_write(&bpf_devs_lock); |
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if (prog->aux->offload) |
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__bpf_prog_offload_destroy(prog); |
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up_write(&bpf_devs_lock); |
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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; |
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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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const struct bpf_prog_ops bpf_offload_prog_ops = { |
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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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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_offload_netdev *ondev; |
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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_ARRAY && |
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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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ondev = bpf_offload_find_netdev(offmap->netdev); |
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if (!ondev) { |
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err = -EINVAL; |
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goto err_unlock; |
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} |
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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, &ondev->maps); |
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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(); |
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kfree(offmap); |
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} |
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int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value) |
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{ |
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struct bpf_offloaded_map *offmap = map_to_offmap(map); |
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int ret = -ENODEV; |
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down_read(&bpf_devs_lock); |
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if (offmap->netdev) |
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ret = offmap->dev_ops->map_lookup_elem(offmap, key, value); |
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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_map_offload_update_elem(struct bpf_map *map, |
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void *key, void *value, u64 flags) |
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{ |
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struct bpf_offloaded_map *offmap = map_to_offmap(map); |
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int ret = -ENODEV; |
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if (unlikely(flags > BPF_EXIST)) |
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return -EINVAL; |
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down_read(&bpf_devs_lock); |
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if (offmap->netdev) |
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ret = offmap->dev_ops->map_update_elem(offmap, key, value, |
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flags); |
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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_map_offload_delete_elem(struct bpf_map *map, void *key) |
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{ |
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struct bpf_offloaded_map *offmap = map_to_offmap(map); |
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int ret = -ENODEV; |
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down_read(&bpf_devs_lock); |
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if (offmap->netdev) |
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ret = offmap->dev_ops->map_delete_elem(offmap, key); |
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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_map_offload_get_next_key(struct bpf_map *map, void *key, void *next_key) |
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{ |
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struct bpf_offloaded_map *offmap = map_to_offmap(map); |
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int ret = -ENODEV; |
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down_read(&bpf_devs_lock); |
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if (offmap->netdev) |
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ret = offmap->dev_ops->map_get_next_key(offmap, key, next_key); |
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up_read(&bpf_devs_lock); |
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return ret; |
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} |
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struct ns_get_path_bpf_map_args { |
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struct bpf_offloaded_map *offmap; |
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struct bpf_map_info *info; |
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}; |
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static struct ns_common *bpf_map_offload_info_fill_ns(void *private_data) |
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{ |
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struct ns_get_path_bpf_map_args *args = private_data; |
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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 (args->offmap->netdev) { |
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args->info->ifindex = args->offmap->netdev->ifindex; |
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net = dev_net(args->offmap->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_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map) |
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{ |
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struct ns_get_path_bpf_map_args args = { |
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.offmap = map_to_offmap(map), |
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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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int res; |
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res = ns_get_path_cb(&ns_path, bpf_map_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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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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static bool __bpf_offload_dev_match(struct bpf_prog *prog, |
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struct net_device *netdev) |
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{ |
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struct bpf_offload_netdev *ondev1, *ondev2; |
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struct bpf_prog_offload *offload; |
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if (!bpf_prog_is_dev_bound(prog->aux)) |
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return false; |
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offload = prog->aux->offload; |
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if (!offload) |
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return false; |
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if (offload->netdev == netdev) |
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return true; |
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ondev1 = bpf_offload_find_netdev(offload->netdev); |
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ondev2 = bpf_offload_find_netdev(netdev); |
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return ondev1 && ondev2 && ondev1->offdev == ondev2->offdev; |
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} |
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bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev) |
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{ |
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bool ret; |
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down_read(&bpf_devs_lock); |
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ret = __bpf_offload_dev_match(prog, netdev); |
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up_read(&bpf_devs_lock); |
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return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(bpf_offload_dev_match); |
|
|
|
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_dev_bound(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) |
|
{ |
|
struct bpf_offload_netdev *ondev; |
|
int err; |
|
|
|
ondev = kzalloc(sizeof(*ondev), GFP_KERNEL); |
|
if (!ondev) |
|
return -ENOMEM; |
|
|
|
ondev->netdev = netdev; |
|
ondev->offdev = offdev; |
|
INIT_LIST_HEAD(&ondev->progs); |
|
INIT_LIST_HEAD(&ondev->maps); |
|
|
|
down_write(&bpf_devs_lock); |
|
err = rhashtable_insert_fast(&offdevs, &ondev->l, offdevs_params); |
|
if (err) { |
|
netdev_warn(netdev, "failed to register for BPF offload\n"); |
|
goto err_unlock_free; |
|
} |
|
|
|
list_add(&ondev->offdev_netdevs, &offdev->netdevs); |
|
up_write(&bpf_devs_lock); |
|
return 0; |
|
|
|
err_unlock_free: |
|
up_write(&bpf_devs_lock); |
|
kfree(ondev); |
|
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) |
|
{ |
|
struct bpf_offload_netdev *ondev, *altdev; |
|
struct bpf_offloaded_map *offmap, *mtmp; |
|
struct bpf_prog_offload *offload, *ptmp; |
|
|
|
ASSERT_RTNL(); |
|
|
|
down_write(&bpf_devs_lock); |
|
ondev = rhashtable_lookup_fast(&offdevs, &netdev, offdevs_params); |
|
if (WARN_ON(!ondev)) |
|
goto unlock; |
|
|
|
WARN_ON(rhashtable_remove_fast(&offdevs, &ondev->l, offdevs_params)); |
|
list_del(&ondev->offdev_netdevs); |
|
|
|
/* Try to move the objects to another netdev of the device */ |
|
altdev = list_first_entry_or_null(&offdev->netdevs, |
|
struct bpf_offload_netdev, |
|
offdev_netdevs); |
|
if (altdev) { |
|
list_for_each_entry(offload, &ondev->progs, offloads) |
|
offload->netdev = altdev->netdev; |
|
list_splice_init(&ondev->progs, &altdev->progs); |
|
|
|
list_for_each_entry(offmap, &ondev->maps, offloads) |
|
offmap->netdev = altdev->netdev; |
|
list_splice_init(&ondev->maps, &altdev->maps); |
|
} else { |
|
list_for_each_entry_safe(offload, ptmp, &ondev->progs, offloads) |
|
__bpf_prog_offload_destroy(offload->prog); |
|
list_for_each_entry_safe(offmap, mtmp, &ondev->maps, offloads) |
|
__bpf_map_offload_destroy(offmap); |
|
} |
|
|
|
WARN_ON(!list_empty(&ondev->progs)); |
|
WARN_ON(!list_empty(&ondev->maps)); |
|
kfree(ondev); |
|
unlock: |
|
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; |
|
int err; |
|
|
|
down_write(&bpf_devs_lock); |
|
if (!offdevs_inited) { |
|
err = rhashtable_init(&offdevs, &offdevs_params); |
|
if (err) { |
|
up_write(&bpf_devs_lock); |
|
return ERR_PTR(err); |
|
} |
|
offdevs_inited = true; |
|
} |
|
up_write(&bpf_devs_lock); |
|
|
|
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);
|
|
|