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![Jakub Kicinski](/assets/img/avatar_default.png)
Allow program sharing between devices which were linked together. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
651 lines
15 KiB
C
651 lines
15 KiB
C
/*
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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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#include <linux/bpf.h>
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#include <linux/bpf_verifier.h>
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#include <linux/debugfs.h>
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/rtnetlink.h>
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#include <net/pkt_cls.h>
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#include "netdevsim.h"
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#define pr_vlog(env, fmt, ...) \
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bpf_verifier_log_write(env, "[netdevsim] " fmt, ##__VA_ARGS__)
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struct nsim_bpf_bound_prog {
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struct netdevsim *ns;
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struct bpf_prog *prog;
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struct dentry *ddir;
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const char *state;
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bool is_loaded;
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struct list_head l;
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};
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#define NSIM_BPF_MAX_KEYS 2
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struct nsim_bpf_bound_map {
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struct netdevsim *ns;
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struct bpf_offloaded_map *map;
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struct mutex mutex;
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struct nsim_map_entry {
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void *key;
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void *value;
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} entry[NSIM_BPF_MAX_KEYS];
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struct list_head l;
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};
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static int nsim_debugfs_bpf_string_read(struct seq_file *file, void *data)
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{
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const char **str = file->private;
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if (*str)
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seq_printf(file, "%s\n", *str);
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return 0;
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}
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static int nsim_debugfs_bpf_string_open(struct inode *inode, struct file *f)
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{
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return single_open(f, nsim_debugfs_bpf_string_read, inode->i_private);
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}
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static const struct file_operations nsim_bpf_string_fops = {
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.owner = THIS_MODULE,
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.open = nsim_debugfs_bpf_string_open,
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.release = single_release,
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.read = seq_read,
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.llseek = seq_lseek
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};
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static int
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nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
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{
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struct nsim_bpf_bound_prog *state;
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state = env->prog->aux->offload->dev_priv;
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if (state->ns->bpf_bind_verifier_delay && !insn_idx)
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msleep(state->ns->bpf_bind_verifier_delay);
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if (insn_idx == env->prog->len - 1)
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pr_vlog(env, "Hello from netdevsim!\n");
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return 0;
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}
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static const struct bpf_prog_offload_ops nsim_bpf_analyzer_ops = {
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.insn_hook = nsim_bpf_verify_insn,
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};
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static bool nsim_xdp_offload_active(struct netdevsim *ns)
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{
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return ns->xdp_hw.prog;
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}
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static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
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{
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struct nsim_bpf_bound_prog *state;
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if (!prog || !prog->aux->offload)
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return;
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state = prog->aux->offload->dev_priv;
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state->is_loaded = loaded;
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}
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static int
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nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
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{
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nsim_prog_set_loaded(ns->bpf_offloaded, false);
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WARN(!!ns->bpf_offloaded != oldprog,
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"bad offload state, expected offload %sto be active",
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oldprog ? "" : "not ");
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ns->bpf_offloaded = prog;
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ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
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nsim_prog_set_loaded(prog, true);
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return 0;
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}
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int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
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void *type_data, void *cb_priv)
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{
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struct tc_cls_bpf_offload *cls_bpf = type_data;
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struct bpf_prog *prog = cls_bpf->prog;
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struct netdevsim *ns = cb_priv;
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struct bpf_prog *oldprog;
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if (type != TC_SETUP_CLSBPF) {
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NSIM_EA(cls_bpf->common.extack,
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"only offload of BPF classifiers supported");
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return -EOPNOTSUPP;
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}
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if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
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return -EOPNOTSUPP;
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if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
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NSIM_EA(cls_bpf->common.extack,
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"only ETH_P_ALL supported as filter protocol");
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return -EOPNOTSUPP;
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}
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if (!ns->bpf_tc_accept) {
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NSIM_EA(cls_bpf->common.extack,
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"netdevsim configured to reject BPF TC offload");
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return -EOPNOTSUPP;
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}
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/* Note: progs without skip_sw will probably not be dev bound */
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if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
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NSIM_EA(cls_bpf->common.extack,
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"netdevsim configured to reject unbound programs");
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return -EOPNOTSUPP;
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}
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if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
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return -EOPNOTSUPP;
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oldprog = cls_bpf->oldprog;
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/* Don't remove if oldprog doesn't match driver's state */
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if (ns->bpf_offloaded != oldprog) {
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oldprog = NULL;
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if (!cls_bpf->prog)
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return 0;
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if (ns->bpf_offloaded) {
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NSIM_EA(cls_bpf->common.extack,
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"driver and netdev offload states mismatch");
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return -EBUSY;
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}
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}
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return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);
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}
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int nsim_bpf_disable_tc(struct netdevsim *ns)
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{
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if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
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return -EBUSY;
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return 0;
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}
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static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
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{
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if (!nsim_xdp_offload_active(ns) && !bpf->prog)
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return 0;
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if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
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NSIM_EA(bpf->extack, "TC program is already loaded");
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return -EBUSY;
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}
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return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
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}
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static int
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nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf,
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struct xdp_attachment_info *xdp)
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{
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int err;
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if (!xdp_attachment_flags_ok(xdp, bpf))
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return -EBUSY;
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if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
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NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
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return -EOPNOTSUPP;
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}
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if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
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NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
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return -EOPNOTSUPP;
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}
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if (bpf->command == XDP_SETUP_PROG_HW) {
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err = nsim_xdp_offload_prog(ns, bpf);
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if (err)
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return err;
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}
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xdp_attachment_setup(xdp, bpf);
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return 0;
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}
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static int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
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{
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struct nsim_bpf_bound_prog *state;
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char name[16];
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state)
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return -ENOMEM;
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state->ns = ns;
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state->prog = prog;
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state->state = "verify";
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/* Program id is not populated yet when we create the state. */
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sprintf(name, "%u", ns->sdev->prog_id_gen++);
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state->ddir = debugfs_create_dir(name, ns->sdev->ddir_bpf_bound_progs);
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if (IS_ERR_OR_NULL(state->ddir)) {
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kfree(state);
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return -ENOMEM;
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}
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debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
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debugfs_create_file("state", 0400, state->ddir,
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&state->state, &nsim_bpf_string_fops);
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debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
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list_add_tail(&state->l, &ns->sdev->bpf_bound_progs);
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prog->aux->offload->dev_priv = state;
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return 0;
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}
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static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
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{
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struct nsim_bpf_bound_prog *state;
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state = prog->aux->offload->dev_priv;
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WARN(state->is_loaded,
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"offload state destroyed while program still bound");
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debugfs_remove_recursive(state->ddir);
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list_del(&state->l);
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kfree(state);
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}
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static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
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{
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if (bpf->prog && bpf->prog->aux->offload) {
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NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
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return -EINVAL;
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}
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if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
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NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
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return -EINVAL;
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}
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return 0;
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}
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static int
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nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
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{
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struct nsim_bpf_bound_prog *state;
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if (!bpf->prog)
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return 0;
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if (!bpf->prog->aux->offload) {
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NSIM_EA(bpf->extack, "xdpoffload of non-bound program");
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return -EINVAL;
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}
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if (!bpf_offload_dev_match(bpf->prog, ns->netdev)) {
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NSIM_EA(bpf->extack, "program bound to different dev");
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return -EINVAL;
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}
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state = bpf->prog->aux->offload->dev_priv;
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if (WARN_ON(strcmp(state->state, "xlated"))) {
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NSIM_EA(bpf->extack, "offloading program in bad state");
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return -EINVAL;
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}
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return 0;
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}
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static bool
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nsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key)
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{
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return e->key && !memcmp(key, e->key, map->key_size);
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}
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static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key)
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{
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struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(nmap->entry); i++)
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if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key))
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return i;
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return -ENOENT;
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}
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static int
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nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx)
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{
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struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
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nmap->entry[idx].key = kmalloc(offmap->map.key_size, GFP_USER);
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if (!nmap->entry[idx].key)
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return -ENOMEM;
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nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_USER);
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if (!nmap->entry[idx].value) {
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kfree(nmap->entry[idx].key);
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nmap->entry[idx].key = NULL;
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return -ENOMEM;
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}
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return 0;
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}
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static int
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nsim_map_get_next_key(struct bpf_offloaded_map *offmap,
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void *key, void *next_key)
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{
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struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
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int idx = -ENOENT;
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mutex_lock(&nmap->mutex);
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if (key)
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idx = nsim_map_key_find(offmap, key);
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if (idx == -ENOENT)
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idx = 0;
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else
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idx++;
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for (; idx < ARRAY_SIZE(nmap->entry); idx++) {
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if (nmap->entry[idx].key) {
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memcpy(next_key, nmap->entry[idx].key,
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offmap->map.key_size);
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break;
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}
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}
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mutex_unlock(&nmap->mutex);
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if (idx == ARRAY_SIZE(nmap->entry))
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return -ENOENT;
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return 0;
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}
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static int
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nsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value)
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{
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struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
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int idx;
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mutex_lock(&nmap->mutex);
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idx = nsim_map_key_find(offmap, key);
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if (idx >= 0)
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memcpy(value, nmap->entry[idx].value, offmap->map.value_size);
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mutex_unlock(&nmap->mutex);
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return idx < 0 ? idx : 0;
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}
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static int
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nsim_map_update_elem(struct bpf_offloaded_map *offmap,
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void *key, void *value, u64 flags)
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{
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struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
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int idx, err = 0;
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mutex_lock(&nmap->mutex);
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idx = nsim_map_key_find(offmap, key);
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if (idx < 0 && flags == BPF_EXIST) {
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err = idx;
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goto exit_unlock;
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}
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if (idx >= 0 && flags == BPF_NOEXIST) {
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err = -EEXIST;
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goto exit_unlock;
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}
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if (idx < 0) {
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for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++)
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if (!nmap->entry[idx].key)
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break;
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if (idx == ARRAY_SIZE(nmap->entry)) {
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err = -E2BIG;
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goto exit_unlock;
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}
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err = nsim_map_alloc_elem(offmap, idx);
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if (err)
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goto exit_unlock;
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}
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memcpy(nmap->entry[idx].key, key, offmap->map.key_size);
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memcpy(nmap->entry[idx].value, value, offmap->map.value_size);
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exit_unlock:
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mutex_unlock(&nmap->mutex);
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return err;
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}
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static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key)
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{
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struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
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int idx;
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if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY)
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return -EINVAL;
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mutex_lock(&nmap->mutex);
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idx = nsim_map_key_find(offmap, key);
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if (idx >= 0) {
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kfree(nmap->entry[idx].key);
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kfree(nmap->entry[idx].value);
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memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx]));
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}
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mutex_unlock(&nmap->mutex);
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return idx < 0 ? idx : 0;
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}
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static const struct bpf_map_dev_ops nsim_bpf_map_ops = {
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.map_get_next_key = nsim_map_get_next_key,
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.map_lookup_elem = nsim_map_lookup_elem,
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.map_update_elem = nsim_map_update_elem,
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.map_delete_elem = nsim_map_delete_elem,
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};
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static int
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nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
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{
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struct nsim_bpf_bound_map *nmap;
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int i, err;
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if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY &&
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offmap->map.map_type != BPF_MAP_TYPE_HASH))
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return -EINVAL;
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if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS)
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return -ENOMEM;
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if (offmap->map.map_flags)
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return -EINVAL;
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nmap = kzalloc(sizeof(*nmap), GFP_USER);
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if (!nmap)
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return -ENOMEM;
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offmap->dev_priv = nmap;
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nmap->ns = ns;
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nmap->map = offmap;
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mutex_init(&nmap->mutex);
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if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) {
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for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
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u32 *key;
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err = nsim_map_alloc_elem(offmap, i);
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if (err)
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goto err_free;
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key = nmap->entry[i].key;
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*key = i;
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}
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}
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|
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offmap->dev_ops = &nsim_bpf_map_ops;
|
|
list_add_tail(&nmap->l, &ns->sdev->bpf_bound_maps);
|
|
|
|
return 0;
|
|
|
|
err_free:
|
|
while (--i >= 0) {
|
|
kfree(nmap->entry[i].key);
|
|
kfree(nmap->entry[i].value);
|
|
}
|
|
kfree(nmap);
|
|
return err;
|
|
}
|
|
|
|
static void nsim_bpf_map_free(struct bpf_offloaded_map *offmap)
|
|
{
|
|
struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
|
|
kfree(nmap->entry[i].key);
|
|
kfree(nmap->entry[i].value);
|
|
}
|
|
list_del_init(&nmap->l);
|
|
mutex_destroy(&nmap->mutex);
|
|
kfree(nmap);
|
|
}
|
|
|
|
int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
|
|
{
|
|
struct netdevsim *ns = netdev_priv(dev);
|
|
struct nsim_bpf_bound_prog *state;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
switch (bpf->command) {
|
|
case BPF_OFFLOAD_VERIFIER_PREP:
|
|
if (!ns->bpf_bind_accept)
|
|
return -EOPNOTSUPP;
|
|
|
|
err = nsim_bpf_create_prog(ns, bpf->verifier.prog);
|
|
if (err)
|
|
return err;
|
|
|
|
bpf->verifier.ops = &nsim_bpf_analyzer_ops;
|
|
return 0;
|
|
case BPF_OFFLOAD_TRANSLATE:
|
|
state = bpf->offload.prog->aux->offload->dev_priv;
|
|
|
|
state->state = "xlated";
|
|
return 0;
|
|
case BPF_OFFLOAD_DESTROY:
|
|
nsim_bpf_destroy_prog(bpf->offload.prog);
|
|
return 0;
|
|
case XDP_QUERY_PROG:
|
|
return xdp_attachment_query(&ns->xdp, bpf);
|
|
case XDP_QUERY_PROG_HW:
|
|
return xdp_attachment_query(&ns->xdp_hw, bpf);
|
|
case XDP_SETUP_PROG:
|
|
err = nsim_setup_prog_checks(ns, bpf);
|
|
if (err)
|
|
return err;
|
|
|
|
return nsim_xdp_set_prog(ns, bpf, &ns->xdp);
|
|
case XDP_SETUP_PROG_HW:
|
|
err = nsim_setup_prog_hw_checks(ns, bpf);
|
|
if (err)
|
|
return err;
|
|
|
|
return nsim_xdp_set_prog(ns, bpf, &ns->xdp_hw);
|
|
case BPF_OFFLOAD_MAP_ALLOC:
|
|
if (!ns->bpf_map_accept)
|
|
return -EOPNOTSUPP;
|
|
|
|
return nsim_bpf_map_alloc(ns, bpf->offmap);
|
|
case BPF_OFFLOAD_MAP_FREE:
|
|
nsim_bpf_map_free(bpf->offmap);
|
|
return 0;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
int nsim_bpf_init(struct netdevsim *ns)
|
|
{
|
|
int err;
|
|
|
|
if (ns->sdev->refcnt == 1) {
|
|
INIT_LIST_HEAD(&ns->sdev->bpf_bound_progs);
|
|
INIT_LIST_HEAD(&ns->sdev->bpf_bound_maps);
|
|
|
|
ns->sdev->ddir_bpf_bound_progs =
|
|
debugfs_create_dir("bpf_bound_progs", ns->sdev->ddir);
|
|
if (IS_ERR_OR_NULL(ns->sdev->ddir_bpf_bound_progs))
|
|
return -ENOMEM;
|
|
|
|
ns->sdev->bpf_dev = bpf_offload_dev_create();
|
|
err = PTR_ERR_OR_ZERO(ns->sdev->bpf_dev);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
err = bpf_offload_dev_netdev_register(ns->sdev->bpf_dev, ns->netdev);
|
|
if (err)
|
|
goto err_destroy_bdev;
|
|
|
|
debugfs_create_u32("bpf_offloaded_id", 0400, ns->ddir,
|
|
&ns->bpf_offloaded_id);
|
|
|
|
ns->bpf_bind_accept = true;
|
|
debugfs_create_bool("bpf_bind_accept", 0600, ns->ddir,
|
|
&ns->bpf_bind_accept);
|
|
debugfs_create_u32("bpf_bind_verifier_delay", 0600, ns->ddir,
|
|
&ns->bpf_bind_verifier_delay);
|
|
|
|
ns->bpf_tc_accept = true;
|
|
debugfs_create_bool("bpf_tc_accept", 0600, ns->ddir,
|
|
&ns->bpf_tc_accept);
|
|
debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ns->ddir,
|
|
&ns->bpf_tc_non_bound_accept);
|
|
ns->bpf_xdpdrv_accept = true;
|
|
debugfs_create_bool("bpf_xdpdrv_accept", 0600, ns->ddir,
|
|
&ns->bpf_xdpdrv_accept);
|
|
ns->bpf_xdpoffload_accept = true;
|
|
debugfs_create_bool("bpf_xdpoffload_accept", 0600, ns->ddir,
|
|
&ns->bpf_xdpoffload_accept);
|
|
|
|
ns->bpf_map_accept = true;
|
|
debugfs_create_bool("bpf_map_accept", 0600, ns->ddir,
|
|
&ns->bpf_map_accept);
|
|
|
|
return 0;
|
|
|
|
err_destroy_bdev:
|
|
if (ns->sdev->refcnt == 1)
|
|
bpf_offload_dev_destroy(ns->sdev->bpf_dev);
|
|
return err;
|
|
}
|
|
|
|
void nsim_bpf_uninit(struct netdevsim *ns)
|
|
{
|
|
WARN_ON(ns->xdp.prog);
|
|
WARN_ON(ns->xdp_hw.prog);
|
|
WARN_ON(ns->bpf_offloaded);
|
|
bpf_offload_dev_netdev_unregister(ns->sdev->bpf_dev, ns->netdev);
|
|
|
|
if (ns->sdev->refcnt == 1) {
|
|
WARN_ON(!list_empty(&ns->sdev->bpf_bound_progs));
|
|
WARN_ON(!list_empty(&ns->sdev->bpf_bound_maps));
|
|
bpf_offload_dev_destroy(ns->sdev->bpf_dev);
|
|
}
|
|
}
|