/* * Copyright (c) 2018 Cumulus Networks. All rights reserved. * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com> * * 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 <net/fib_notifier.h>#include <net/ip_fib.h>#include <net/ip6_fib.h>#include <net/fib_rules.h>#include <net/netns/generic.h> #include "netdevsim.h" struct nsim_fib_entry {	u64 max;	u64 num;}; struct nsim_per_fib_data {	struct nsim_fib_entry fib;	struct nsim_fib_entry rules;}; struct nsim_fib_data {	struct nsim_per_fib_data ipv4;	struct nsim_per_fib_data ipv6;}; static unsigned int nsim_fib_net_id; u64 nsim_fib_get_val(struct net *net, enum nsim_resource_id res_id, bool max){	struct nsim_fib_data *fib_data = net_generic(net, nsim_fib_net_id);	struct nsim_fib_entry *entry; 	switch (res_id) {	case NSIM_RESOURCE_IPV4_FIB:		entry = &fib_data->ipv4.fib;		break;	case NSIM_RESOURCE_IPV4_FIB_RULES:		entry = &fib_data->ipv4.rules;		break;	case NSIM_RESOURCE_IPV6_FIB:		entry = &fib_data->ipv6.fib;		break;	case NSIM_RESOURCE_IPV6_FIB_RULES:		entry = &fib_data->ipv6.rules;		break;	default:		return 0;	} 	return max ? entry->max : entry->num;} int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val){	struct nsim_fib_data *fib_data = net_generic(net, nsim_fib_net_id);	struct nsim_fib_entry *entry;	int err = 0; 	switch (res_id) {	case NSIM_RESOURCE_IPV4_FIB:		entry = &fib_data->ipv4.fib;		break;	case NSIM_RESOURCE_IPV4_FIB_RULES:		entry = &fib_data->ipv4.rules;		break;	case NSIM_RESOURCE_IPV6_FIB:		entry = &fib_data->ipv6.fib;		break;	case NSIM_RESOURCE_IPV6_FIB_RULES:		entry = &fib_data->ipv6.rules;		break;	default:		return 0;	} 	/* not allowing a new max to be less than curren occupancy	 * --> no means of evicting entries	 */	if (val < entry->num)		err = -EINVAL;	else		entry->max = val; 	return err;} static int nsim_fib_rule_account(struct nsim_fib_entry *entry, bool add,				 struct netlink_ext_ack *extack){	int err = 0; 	if (add) {		if (entry->num < entry->max) {			entry->num++;		} else {			err = -ENOSPC;			NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported fib rule entries");		}	} else {		entry->num--;	} 	return err;} static int nsim_fib_rule_event(struct fib_notifier_info *info, bool add){	struct nsim_fib_data *data = net_generic(info->net, nsim_fib_net_id);	struct netlink_ext_ack *extack = info->extack;	int err = 0; 	switch (info->family) {	case AF_INET:		err = nsim_fib_rule_account(&data->ipv4.rules, add, extack);		break;	case AF_INET6:		err = nsim_fib_rule_account(&data->ipv6.rules, add, extack);		break;	} 	return err;} static int nsim_fib_account(struct nsim_fib_entry *entry, bool add,			    struct netlink_ext_ack *extack){	int err = 0; 	if (add) {		if (entry->num < entry->max) {			entry->num++;		} else {			err = -ENOSPC;			NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported fib entries");		}	} else {		entry->num--;	} 	return err;} static int nsim_fib_event(struct fib_notifier_info *info, bool add){	struct nsim_fib_data *data = net_generic(info->net, nsim_fib_net_id);	struct netlink_ext_ack *extack = info->extack;	int err = 0; 	switch (info->family) {	case AF_INET:		err = nsim_fib_account(&data->ipv4.fib, add, extack);		break;	case AF_INET6:		err = nsim_fib_account(&data->ipv6.fib, add, extack);		break;	} 	return err;} static int nsim_fib_event_nb(struct notifier_block *nb, unsigned long event,			     void *ptr){	struct fib_notifier_info *info = ptr;	int err = 0; 	switch (event) {	case FIB_EVENT_RULE_ADD: /* fall through */	case FIB_EVENT_RULE_DEL:		err = nsim_fib_rule_event(info, event == FIB_EVENT_RULE_ADD);		break; 	case FIB_EVENT_ENTRY_ADD:  /* fall through */	case FIB_EVENT_ENTRY_DEL:		err = nsim_fib_event(info, event == FIB_EVENT_ENTRY_ADD);		break;	} 	return notifier_from_errno(err);} /* inconsistent dump, trying again */static void nsim_fib_dump_inconsistent(struct notifier_block *nb){	struct nsim_fib_data *data;	struct net *net; 	rcu_read_lock();	for_each_net_rcu(net) {		data = net_generic(net, nsim_fib_net_id); 		data->ipv4.fib.num = 0ULL;		data->ipv4.rules.num = 0ULL; 		data->ipv6.fib.num = 0ULL;		data->ipv6.rules.num = 0ULL;	}	rcu_read_unlock();} static struct notifier_block nsim_fib_nb = {	.notifier_call = nsim_fib_event_nb,}; /* Initialize per network namespace state */static int __net_init nsim_fib_netns_init(struct net *net){	struct nsim_fib_data *data = net_generic(net, nsim_fib_net_id); 	data->ipv4.fib.max = (u64)-1;	data->ipv4.rules.max = (u64)-1; 	data->ipv6.fib.max = (u64)-1;	data->ipv6.rules.max = (u64)-1; 	return 0;} static struct pernet_operations nsim_fib_net_ops = {	.init = nsim_fib_netns_init,	.id   = &nsim_fib_net_id,	.size = sizeof(struct nsim_fib_data),}; void nsim_fib_exit(void){	unregister_pernet_subsys(&nsim_fib_net_ops);	unregister_fib_notifier(&nsim_fib_nb);} int nsim_fib_init(void){	int err; 	err = register_pernet_subsys(&nsim_fib_net_ops);	if (err < 0) {		pr_err("Failed to register pernet subsystem\n");		goto err_out;	} 	err = register_fib_notifier(&nsim_fib_nb, nsim_fib_dump_inconsistent);	if (err < 0) {		pr_err("Failed to register fib notifier\n");		goto err_out;	} err_out:	return err;}