/* * 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 netdevsim *ns;	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_debugfs_bpf_string_read(struct seq_file *file, void *data){	const char **str = file->private; 	if (*str)		seq_printf(file, "%s\n", *str); 	return 0;} static int nsim_debugfs_bpf_string_open(struct inode *inode, struct file *f){	return single_open(f, nsim_debugfs_bpf_string_read, inode->i_private);} static const struct file_operations nsim_bpf_string_fops = {	.owner = THIS_MODULE,	.open = nsim_debugfs_bpf_string_open,	.release = single_release,	.read = seq_read,	.llseek = seq_lseek}; static intnsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn){	struct nsim_bpf_bound_prog *state; 	state = env->prog->aux->offload->dev_priv;	if (state->ns->bpf_bind_verifier_delay && !insn_idx)		msleep(state->ns->bpf_bind_verifier_delay); 	if (insn_idx == env->prog->len - 1)		pr_vlog(env, "Hello from netdevsim!\n"); 	return 0;} static const struct bpf_prog_offload_ops nsim_bpf_analyzer_ops = {	.insn_hook = nsim_bpf_verify_insn,}; 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 || !prog->aux->offload)		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 (type != TC_SETUP_CLSBPF) {		NSIM_EA(cls_bpf->common.extack,			"only offload of BPF classifiers supported");		return -EOPNOTSUPP;	} 	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 (!xdp_attachment_flags_ok(xdp, bpf))		return -EBUSY; 	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 netdevsim *ns, struct bpf_prog *prog){	struct nsim_bpf_bound_prog *state;	char name[16]; 	state = kzalloc(sizeof(*state), GFP_KERNEL);	if (!state)		return -ENOMEM; 	state->ns = ns;	state->prog = prog;	state->state = "verify"; 	/* Program id is not populated yet when we create the state. */	sprintf(name, "%u", ns->sdev->prog_id_gen++);	state->ddir = debugfs_create_dir(name, ns->sdev->ddir_bpf_bound_progs);	if (IS_ERR_OR_NULL(state->ddir)) {		kfree(state);		return -ENOMEM;	} 	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); 	list_add_tail(&state->l, &ns->sdev->bpf_bound_progs); 	prog->aux->offload->dev_priv = state; 	return 0;} static void nsim_bpf_destroy_prog(struct bpf_prog *prog){	struct nsim_bpf_bound_prog *state; 	state = prog->aux->offload->dev_priv;	WARN(state->is_loaded,	     "offload state destroyed while program still bound");	debugfs_remove_recursive(state->ddir);	list_del(&state->l);	kfree(state);} 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 (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->aux->offload) {		NSIM_EA(bpf->extack, "xdpoffload of non-bound program");		return -EINVAL;	}	if (!bpf_offload_dev_match(bpf->prog, ns->netdev)) {		NSIM_EA(bpf->extack, "program bound to different dev");		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_USER);	if (!nmap->entry[idx].key)		return -ENOMEM;	nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_USER);	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(sizeof(*nmap), GFP_USER);	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;		}	} 	offmap->dev_ops = &nsim_bpf_map_ops;	list_add_tail(&nmap->l, &ns->sdev->bpf_bound_maps);

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