2 * Copyright (C) 2017 Netronome Systems, Inc.
4 * This software is licensed under the GNU General License Version 2,
5 * June 1991 as shown in the file COPYING in the top-level directory of this
8 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
9 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
10 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
12 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
13 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16 #include <linux/bpf.h>
17 #include <linux/bpf_verifier.h>
18 #include <linux/bug.h>
19 #include <linux/list.h>
20 #include <linux/netdevice.h>
21 #include <linux/printk.h>
22 #include <linux/rtnetlink.h>
24 /* protected by RTNL */
25 static LIST_HEAD(bpf_prog_offload_devs);
27 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
29 struct net *net = current->nsproxy->net_ns;
30 struct bpf_dev_offload *offload;
32 if (attr->prog_type != BPF_PROG_TYPE_SCHED_CLS &&
33 attr->prog_type != BPF_PROG_TYPE_XDP)
39 offload = kzalloc(sizeof(*offload), GFP_USER);
44 init_waitqueue_head(&offload->verifier_done);
47 offload->netdev = __dev_get_by_index(net, attr->prog_ifindex);
48 if (!offload->netdev) {
54 prog->aux->offload = offload;
55 list_add_tail(&offload->offloads, &bpf_prog_offload_devs);
61 static int __bpf_offload_ndo(struct bpf_prog *prog, enum bpf_netdev_command cmd,
62 struct netdev_bpf *data)
64 struct net_device *netdev = prog->aux->offload->netdev;
70 if (!netdev->netdev_ops->ndo_bpf)
75 return netdev->netdev_ops->ndo_bpf(netdev, data);
78 int bpf_prog_offload_verifier_prep(struct bpf_verifier_env *env)
80 struct netdev_bpf data = {};
83 data.verifier.prog = env->prog;
86 err = __bpf_offload_ndo(env->prog, BPF_OFFLOAD_VERIFIER_PREP, &data);
90 env->dev_ops = data.verifier.ops;
92 env->prog->aux->offload->dev_state = true;
93 env->prog->aux->offload->verifier_running = true;
99 static void __bpf_prog_offload_destroy(struct bpf_prog *prog)
101 struct bpf_dev_offload *offload = prog->aux->offload;
102 struct netdev_bpf data = {};
104 /* Caution - if netdev is destroyed before the program, this function
105 * will be called twice.
108 data.offload.prog = prog;
110 if (offload->verifier_running)
111 wait_event(offload->verifier_done, !offload->verifier_running);
113 if (offload->dev_state)
114 WARN_ON(__bpf_offload_ndo(prog, BPF_OFFLOAD_DESTROY, &data));
116 offload->dev_state = false;
117 list_del_init(&offload->offloads);
118 offload->netdev = NULL;
121 void bpf_prog_offload_destroy(struct bpf_prog *prog)
123 struct bpf_dev_offload *offload = prog->aux->offload;
125 offload->verifier_running = false;
126 wake_up(&offload->verifier_done);
129 __bpf_prog_offload_destroy(prog);
135 static int bpf_prog_offload_translate(struct bpf_prog *prog)
137 struct bpf_dev_offload *offload = prog->aux->offload;
138 struct netdev_bpf data = {};
141 data.offload.prog = prog;
143 offload->verifier_running = false;
144 wake_up(&offload->verifier_done);
147 ret = __bpf_offload_ndo(prog, BPF_OFFLOAD_TRANSLATE, &data);
153 static unsigned int bpf_prog_warn_on_exec(const void *ctx,
154 const struct bpf_insn *insn)
156 WARN(1, "attempt to execute device eBPF program on the host!");
160 int bpf_prog_offload_compile(struct bpf_prog *prog)
162 prog->bpf_func = bpf_prog_warn_on_exec;
164 return bpf_prog_offload_translate(prog);
167 const struct bpf_prog_ops bpf_offload_prog_ops = {
170 static int bpf_offload_notification(struct notifier_block *notifier,
171 ulong event, void *ptr)
173 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
174 struct bpf_dev_offload *offload, *tmp;
179 case NETDEV_UNREGISTER:
180 /* ignore namespace changes */
181 if (netdev->reg_state != NETREG_UNREGISTERING)
184 list_for_each_entry_safe(offload, tmp, &bpf_prog_offload_devs,
186 if (offload->netdev == netdev)
187 __bpf_prog_offload_destroy(offload->prog);
196 static struct notifier_block bpf_offload_notifier = {
197 .notifier_call = bpf_offload_notification,
200 static int __init bpf_offload_init(void)
202 register_netdevice_notifier(&bpf_offload_notifier);
206 subsys_initcall(bpf_offload_init);