Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655/* * Copyright (C) 2017 Netronome Systems, Inc. * * This software is licensed under the GNU General License Version 2, * June 1991 as shown in the file COPYING in the top-level directory of this * source tree. * * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. */
#include <linux/bpf.h>#include <linux/bpf_verifier.h>#include <linux/debugfs.h>#include <linux/kernel.h>#include <linux/mutex.h>#include <linux/rtnetlink.h>#include <net/pkt_cls.h>
#include "netdevsim.h"
#define pr_vlog(env, fmt, ...) \ bpf_verifier_log_write(env, "[netdevsim] " fmt, ##__VA_ARGS__)
struct nsim_bpf_bound_prog { struct nsim_dev *nsim_dev; struct bpf_prog *prog; struct dentry *ddir; const char *state; bool is_loaded; struct list_head l;};
#define NSIM_BPF_MAX_KEYS 2
struct nsim_bpf_bound_map { struct netdevsim *ns; struct bpf_offloaded_map *map; struct mutex mutex; struct nsim_map_entry { void *key; void *value; } entry[NSIM_BPF_MAX_KEYS]; struct list_head l;};
static int nsim_bpf_string_show(struct seq_file *file, void *data){ const char **str = file->private;
if (*str) seq_printf(file, "%s\n", *str);
return 0;}DEFINE_SHOW_ATTRIBUTE(nsim_bpf_string);
static intnsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn){ struct nsim_bpf_bound_prog *state; int ret = 0;
state = env->prog->aux->offload->dev_priv; if (state->nsim_dev->bpf_bind_verifier_delay && !insn_idx) msleep(state->nsim_dev->bpf_bind_verifier_delay);
if (insn_idx == env->prog->len - 1) { pr_vlog(env, "Hello from netdevsim!\n");
if (!state->nsim_dev->bpf_bind_verifier_accept) ret = -EOPNOTSUPP; }
return ret;}
static int nsim_bpf_finalize(struct bpf_verifier_env *env){ return 0;}
static bool nsim_xdp_offload_active(struct netdevsim *ns){ return ns->xdp_hw.prog;}
static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded){ struct nsim_bpf_bound_prog *state;
if (!prog || !bpf_prog_is_offloaded(prog->aux)) return;
state = prog->aux->offload->dev_priv; state->is_loaded = loaded;}
static intnsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog){ nsim_prog_set_loaded(ns->bpf_offloaded, false);
WARN(!!ns->bpf_offloaded != oldprog, "bad offload state, expected offload %sto be active", oldprog ? "" : "not "); ns->bpf_offloaded = prog; ns->bpf_offloaded_id = prog ? prog->aux->id : 0; nsim_prog_set_loaded(prog, true);
return 0;}
int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv){ struct tc_cls_bpf_offload *cls_bpf = type_data; struct bpf_prog *prog = cls_bpf->prog; struct netdevsim *ns = cb_priv; struct bpf_prog *oldprog;
if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common)) return -EOPNOTSUPP;
if (cls_bpf->common.protocol != htons(ETH_P_ALL)) { NSIM_EA(cls_bpf->common.extack, "only ETH_P_ALL supported as filter protocol"); return -EOPNOTSUPP; }
if (!ns->bpf_tc_accept) { NSIM_EA(cls_bpf->common.extack, "netdevsim configured to reject BPF TC offload"); return -EOPNOTSUPP; } /* Note: progs without skip_sw will probably not be dev bound */ if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) { NSIM_EA(cls_bpf->common.extack, "netdevsim configured to reject unbound programs"); return -EOPNOTSUPP; }
if (cls_bpf->command != TC_CLSBPF_OFFLOAD) return -EOPNOTSUPP;
oldprog = cls_bpf->oldprog;
/* Don't remove if oldprog doesn't match driver's state */ if (ns->bpf_offloaded != oldprog) { oldprog = NULL; if (!cls_bpf->prog) return 0; if (ns->bpf_offloaded) { NSIM_EA(cls_bpf->common.extack, "driver and netdev offload states mismatch"); return -EBUSY; } }
return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);}
int nsim_bpf_disable_tc(struct netdevsim *ns){ if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns)) return -EBUSY; return 0;}
static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf){ if (!nsim_xdp_offload_active(ns) && !bpf->prog) return 0; if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) { NSIM_EA(bpf->extack, "TC program is already loaded"); return -EBUSY; }
return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));}
static intnsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf, struct xdp_attachment_info *xdp){ int err;
if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) { NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS"); return -EOPNOTSUPP; } if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) { NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS"); return -EOPNOTSUPP; }
if (bpf->command == XDP_SETUP_PROG_HW) { err = nsim_xdp_offload_prog(ns, bpf); if (err) return err; }
xdp_attachment_setup(xdp, bpf);
return 0;}
static int nsim_bpf_create_prog(struct nsim_dev *nsim_dev, struct bpf_prog *prog){ struct nsim_bpf_bound_prog *state; char name[16]; int ret;
state = kzalloc_obj(*state); if (!state) return -ENOMEM;
state->nsim_dev = nsim_dev; state->prog = prog; state->state = "verify";
/* Program id is not populated yet when we create the state. */ sprintf(name, "%u", nsim_dev->prog_id_gen++); state->ddir = debugfs_create_dir(name, nsim_dev->ddir_bpf_bound_progs); if (IS_ERR(state->ddir)) { ret = PTR_ERR(state->ddir); kfree(state); return ret; }
debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id); debugfs_create_file("state", 0400, state->ddir, &state->state, &nsim_bpf_string_fops); debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
mutex_lock(&nsim_dev->progs_list_lock); list_add_tail(&state->l, &nsim_dev->bpf_bound_progs); mutex_unlock(&nsim_dev->progs_list_lock);
prog->aux->offload->dev_priv = state;
return 0;}
static int nsim_bpf_verifier_prep(struct bpf_prog *prog){ struct nsim_dev *nsim_dev = bpf_offload_dev_priv(prog->aux->offload->offdev);
if (!nsim_dev->bpf_bind_accept) return -EOPNOTSUPP;
return nsim_bpf_create_prog(nsim_dev, prog);}
static int nsim_bpf_translate(struct bpf_prog *prog){ struct nsim_bpf_bound_prog *state = prog->aux->offload->dev_priv;
state->state = "xlated"; return 0;}
static void nsim_bpf_destroy_prog(struct bpf_prog *prog){ struct nsim_bpf_bound_prog *state; struct nsim_dev *nsim_dev;
state = prog->aux->offload->dev_priv; nsim_dev = state->nsim_dev; WARN(state->is_loaded, "offload state destroyed while program still bound"); debugfs_remove_recursive(state->ddir); mutex_lock(&nsim_dev->progs_list_lock); list_del(&state->l); mutex_unlock(&nsim_dev->progs_list_lock); kfree(state);}
static const struct bpf_prog_offload_ops nsim_bpf_dev_ops = { .insn_hook = nsim_bpf_verify_insn, .finalize = nsim_bpf_finalize, .prepare = nsim_bpf_verifier_prep, .translate = nsim_bpf_translate, .destroy = nsim_bpf_destroy_prog,};
static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf){ if (bpf->prog && bpf->prog->aux->offload) { NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv"); return -EINVAL; } if (bpf->prog && !bpf->prog->aux->xdp_has_frags && ns->netdev->mtu > NSIM_XDP_MAX_MTU) { NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled"); return -EINVAL; } return 0;}
static intnsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf){ struct nsim_bpf_bound_prog *state;
if (!bpf->prog) return 0;
if (!bpf_prog_is_offloaded(bpf->prog->aux)) { NSIM_EA(bpf->extack, "xdpoffload of non-bound program"); return -EINVAL; }
state = bpf->prog->aux->offload->dev_priv; if (WARN_ON(strcmp(state->state, "xlated"))) { NSIM_EA(bpf->extack, "offloading program in bad state"); return -EINVAL; } return 0;}
static boolnsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key){ return e->key && !memcmp(key, e->key, map->key_size);}
static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key){ struct nsim_bpf_bound_map *nmap = offmap->dev_priv; unsigned int i;
for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key)) return i;
return -ENOENT;}
static intnsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx){ struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
nmap->entry[idx].key = kmalloc(offmap->map.key_size, GFP_KERNEL_ACCOUNT | __GFP_NOWARN); if (!nmap->entry[idx].key) return -ENOMEM; nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_KERNEL_ACCOUNT | __GFP_NOWARN); if (!nmap->entry[idx].value) { kfree(nmap->entry[idx].key); nmap->entry[idx].key = NULL; return -ENOMEM; }
return 0;}
static intnsim_map_get_next_key(struct bpf_offloaded_map *offmap, void *key, void *next_key){ struct nsim_bpf_bound_map *nmap = offmap->dev_priv; int idx = -ENOENT;
mutex_lock(&nmap->mutex);
if (key) idx = nsim_map_key_find(offmap, key); if (idx == -ENOENT) idx = 0; else idx++;
for (; idx < ARRAY_SIZE(nmap->entry); idx++) { if (nmap->entry[idx].key) { memcpy(next_key, nmap->entry[idx].key, offmap->map.key_size); break; } }
mutex_unlock(&nmap->mutex);
if (idx == ARRAY_SIZE(nmap->entry)) return -ENOENT; return 0;}
static intnsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value){ struct nsim_bpf_bound_map *nmap = offmap->dev_priv; int idx;
mutex_lock(&nmap->mutex);
idx = nsim_map_key_find(offmap, key); if (idx >= 0) memcpy(value, nmap->entry[idx].value, offmap->map.value_size);
mutex_unlock(&nmap->mutex);
return idx < 0 ? idx : 0;}
static intnsim_map_update_elem(struct bpf_offloaded_map *offmap, void *key, void *value, u64 flags){ struct nsim_bpf_bound_map *nmap = offmap->dev_priv; int idx, err = 0;
mutex_lock(&nmap->mutex);
idx = nsim_map_key_find(offmap, key); if (idx < 0 && flags == BPF_EXIST) { err = idx; goto exit_unlock; } if (idx >= 0 && flags == BPF_NOEXIST) { err = -EEXIST; goto exit_unlock; }
if (idx < 0) { for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++) if (!nmap->entry[idx].key) break; if (idx == ARRAY_SIZE(nmap->entry)) { err = -E2BIG; goto exit_unlock; }
err = nsim_map_alloc_elem(offmap, idx); if (err) goto exit_unlock; }
memcpy(nmap->entry[idx].key, key, offmap->map.key_size); memcpy(nmap->entry[idx].value, value, offmap->map.value_size);exit_unlock: mutex_unlock(&nmap->mutex);
return err;}
static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key){ struct nsim_bpf_bound_map *nmap = offmap->dev_priv; int idx;
if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) return -EINVAL;
mutex_lock(&nmap->mutex);
idx = nsim_map_key_find(offmap, key); if (idx >= 0) { kfree(nmap->entry[idx].key); kfree(nmap->entry[idx].value); memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx])); }
mutex_unlock(&nmap->mutex);
return idx < 0 ? idx : 0;}
static const struct bpf_map_dev_ops nsim_bpf_map_ops = { .map_get_next_key = nsim_map_get_next_key, .map_lookup_elem = nsim_map_lookup_elem, .map_update_elem = nsim_map_update_elem, .map_delete_elem = nsim_map_delete_elem,};
static intnsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap){ struct nsim_bpf_bound_map *nmap; int i, err;
if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY && offmap->map.map_type != BPF_MAP_TYPE_HASH)) return -EINVAL; if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS) return -ENOMEM; if (offmap->map.map_flags) return -EINVAL;
nmap = kzalloc_obj(*nmap, GFP_KERNEL_ACCOUNT); if (!nmap) return -ENOMEM;
offmap->dev_priv = nmap; nmap->ns = ns; nmap->map = offmap; mutex_init(&nmap->mutex);
if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) { for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) { u32 *key;
err = nsim_map_alloc_elem(offmap, i); if (err) goto err_free; key = nmap->entry[i].key; *key = i; memset(nmap->entry[i].value, 0, offmap->map.value_size); } }
offmap->dev_ops = &nsim_bpf_map_ops; list_add_tail(&nmap->l, &ns->nsim_dev->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); int err;
ASSERT_RTNL();
switch (bpf->command) { 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_dev_init(struct nsim_dev *nsim_dev){ int err;
INIT_LIST_HEAD(&nsim_dev->bpf_bound_progs); INIT_LIST_HEAD(&nsim_dev->bpf_bound_maps);
nsim_dev->ddir_bpf_bound_progs = debugfs_create_dir("bpf_bound_progs", nsim_dev->ddir); if (IS_ERR(nsim_dev->ddir_bpf_bound_progs)) return PTR_ERR(nsim_dev->ddir_bpf_bound_progs);
nsim_dev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops, nsim_dev); err = PTR_ERR_OR_ZERO(nsim_dev->bpf_dev); if (err) return err;
nsim_dev->bpf_bind_accept = true; debugfs_create_bool("bpf_bind_accept", 0600, nsim_dev->ddir, &nsim_dev->bpf_bind_accept); debugfs_create_u32("bpf_bind_verifier_delay", 0600, nsim_dev->ddir, &nsim_dev->bpf_bind_verifier_delay); nsim_dev->bpf_bind_verifier_accept = true; debugfs_create_bool("bpf_bind_verifier_accept", 0600, nsim_dev->ddir, &nsim_dev->bpf_bind_verifier_accept); return 0;}
void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev){ WARN_ON(!list_empty(&nsim_dev->bpf_bound_progs)); WARN_ON(!list_empty(&nsim_dev->bpf_bound_maps)); bpf_offload_dev_destroy(nsim_dev->bpf_dev);}
int nsim_bpf_init(struct netdevsim *ns){ struct dentry *ddir = ns->nsim_dev_port->ddir; int err;
err = bpf_offload_dev_netdev_register(ns->nsim_dev->bpf_dev, ns->netdev); if (err) return err;
debugfs_create_u32("bpf_offloaded_id", 0400, ddir, &ns->bpf_offloaded_id);
ns->bpf_tc_accept = true; debugfs_create_bool("bpf_tc_accept", 0600, ddir, &ns->bpf_tc_accept); debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ddir, &ns->bpf_tc_non_bound_accept); ns->bpf_xdpdrv_accept = true; debugfs_create_bool("bpf_xdpdrv_accept", 0600, ddir, &ns->bpf_xdpdrv_accept); ns->bpf_xdpoffload_accept = true; debugfs_create_bool("bpf_xdpoffload_accept", 0600, ddir, &ns->bpf_xdpoffload_accept);
ns->bpf_map_accept = true; debugfs_create_bool("bpf_map_accept", 0600, ddir, &ns->bpf_map_accept);
return 0;}
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->nsim_dev->bpf_dev, ns->netdev);}