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OpenCloudOS-Kernel/drivers/net/netdevsim/fib.c

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/*
* 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 <linux/in6.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/rhashtable.h>
#include <linux/spinlock_types.h>
#include <linux/types.h>
#include <net/fib_notifier.h>
#include <net/ip_fib.h>
#include <net/ip6_fib.h>
#include <net/fib_rules.h>
#include <net/net_namespace.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 notifier_block fib_nb;
struct nsim_per_fib_data ipv4;
struct nsim_per_fib_data ipv6;
struct rhashtable fib_rt_ht;
struct list_head fib_rt_list;
spinlock_t fib_lock; /* Protects hashtable, list and accounting */
struct devlink *devlink;
};
struct nsim_fib_rt_key {
unsigned char addr[sizeof(struct in6_addr)];
unsigned char prefix_len;
int family;
u32 tb_id;
};
struct nsim_fib_rt {
struct nsim_fib_rt_key key;
struct rhash_head ht_node;
struct list_head list; /* Member of fib_rt_list */
};
struct nsim_fib4_rt {
struct nsim_fib_rt common;
struct fib_info *fi;
u8 tos;
u8 type;
};
struct nsim_fib6_rt {
struct nsim_fib_rt common;
struct list_head nh_list;
unsigned int nhs;
};
struct nsim_fib6_rt_nh {
struct list_head list; /* Member of nh_list */
struct fib6_info *rt;
};
static const struct rhashtable_params nsim_fib_rt_ht_params = {
.key_offset = offsetof(struct nsim_fib_rt, key),
.head_offset = offsetof(struct nsim_fib_rt, ht_node),
.key_len = sizeof(struct nsim_fib_rt_key),
.automatic_shrinking = true,
};
u64 nsim_fib_get_val(struct nsim_fib_data *fib_data,
enum nsim_resource_id res_id, bool max)
{
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;
}
static void nsim_fib_set_max(struct nsim_fib_data *fib_data,
enum nsim_resource_id res_id, u64 val)
{
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:
WARN_ON(1);
return;
}
entry->max = val;
}
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 nsim_fib_data *data,
struct fib_notifier_info *info, bool add)
{
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 void nsim_fib_rt_init(struct nsim_fib_data *data,
struct nsim_fib_rt *fib_rt, const void *addr,
size_t addr_len, unsigned int prefix_len,
int family, u32 tb_id)
{
memcpy(fib_rt->key.addr, addr, addr_len);
fib_rt->key.prefix_len = prefix_len;
fib_rt->key.family = family;
fib_rt->key.tb_id = tb_id;
list_add(&fib_rt->list, &data->fib_rt_list);
}
static void nsim_fib_rt_fini(struct nsim_fib_rt *fib_rt)
{
list_del(&fib_rt->list);
}
static struct nsim_fib_rt *nsim_fib_rt_lookup(struct rhashtable *fib_rt_ht,
const void *addr, size_t addr_len,
unsigned int prefix_len,
int family, u32 tb_id)
{
struct nsim_fib_rt_key key;
memset(&key, 0, sizeof(key));
memcpy(key.addr, addr, addr_len);
key.prefix_len = prefix_len;
key.family = family;
key.tb_id = tb_id;
return rhashtable_lookup_fast(fib_rt_ht, &key, nsim_fib_rt_ht_params);
}
static struct nsim_fib4_rt *
nsim_fib4_rt_create(struct nsim_fib_data *data,
struct fib_entry_notifier_info *fen_info)
{
struct nsim_fib4_rt *fib4_rt;
fib4_rt = kzalloc(sizeof(*fib4_rt), GFP_ATOMIC);
if (!fib4_rt)
return NULL;
nsim_fib_rt_init(data, &fib4_rt->common, &fen_info->dst, sizeof(u32),
fen_info->dst_len, AF_INET, fen_info->tb_id);
fib4_rt->fi = fen_info->fi;
fib_info_hold(fib4_rt->fi);
fib4_rt->tos = fen_info->tos;
fib4_rt->type = fen_info->type;
return fib4_rt;
}
static void nsim_fib4_rt_destroy(struct nsim_fib4_rt *fib4_rt)
{
fib_info_put(fib4_rt->fi);
nsim_fib_rt_fini(&fib4_rt->common);
kfree(fib4_rt);
}
static struct nsim_fib4_rt *
nsim_fib4_rt_lookup(struct rhashtable *fib_rt_ht,
const struct fib_entry_notifier_info *fen_info)
{
struct nsim_fib_rt *fib_rt;
fib_rt = nsim_fib_rt_lookup(fib_rt_ht, &fen_info->dst, sizeof(u32),
fen_info->dst_len, AF_INET,
fen_info->tb_id);
if (!fib_rt)
return NULL;
return container_of(fib_rt, struct nsim_fib4_rt, common);
}
static void nsim_fib4_rt_hw_flags_set(struct net *net,
const struct nsim_fib4_rt *fib4_rt,
bool trap)
{
u32 *p_dst = (u32 *) fib4_rt->common.key.addr;
int dst_len = fib4_rt->common.key.prefix_len;
struct fib_rt_info fri;
fri.fi = fib4_rt->fi;
fri.tb_id = fib4_rt->common.key.tb_id;
fri.dst = cpu_to_be32(*p_dst);
fri.dst_len = dst_len;
fri.tos = fib4_rt->tos;
fri.type = fib4_rt->type;
fri.offload = false;
fri.trap = trap;
fib_alias_hw_flags_set(net, &fri);
}
static int nsim_fib4_rt_add(struct nsim_fib_data *data,
struct nsim_fib4_rt *fib4_rt,
struct netlink_ext_ack *extack)
{
struct net *net = devlink_net(data->devlink);
int err;
err = nsim_fib_account(&data->ipv4.fib, true, extack);
if (err)
return err;
err = rhashtable_insert_fast(&data->fib_rt_ht,
&fib4_rt->common.ht_node,
nsim_fib_rt_ht_params);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed to insert IPv4 route");
goto err_fib_dismiss;
}
nsim_fib4_rt_hw_flags_set(net, fib4_rt, true);
return 0;
err_fib_dismiss:
nsim_fib_account(&data->ipv4.fib, false, extack);
return err;
}
static int nsim_fib4_rt_replace(struct nsim_fib_data *data,
struct nsim_fib4_rt *fib4_rt,
struct nsim_fib4_rt *fib4_rt_old,
struct netlink_ext_ack *extack)
{
struct net *net = devlink_net(data->devlink);
int err;
/* We are replacing a route, so no need to change the accounting. */
err = rhashtable_replace_fast(&data->fib_rt_ht,
&fib4_rt_old->common.ht_node,
&fib4_rt->common.ht_node,
nsim_fib_rt_ht_params);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed to replace IPv4 route");
return err;
}
nsim_fib4_rt_hw_flags_set(net, fib4_rt, true);
nsim_fib4_rt_hw_flags_set(net, fib4_rt_old, false);
nsim_fib4_rt_destroy(fib4_rt_old);
return 0;
}
static int nsim_fib4_rt_insert(struct nsim_fib_data *data,
struct fib_entry_notifier_info *fen_info)
{
struct netlink_ext_ack *extack = fen_info->info.extack;
struct nsim_fib4_rt *fib4_rt, *fib4_rt_old;
int err;
fib4_rt = nsim_fib4_rt_create(data, fen_info);
if (!fib4_rt)
return -ENOMEM;
fib4_rt_old = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info);
if (!fib4_rt_old)
err = nsim_fib4_rt_add(data, fib4_rt, extack);
else
err = nsim_fib4_rt_replace(data, fib4_rt, fib4_rt_old, extack);
if (err)
nsim_fib4_rt_destroy(fib4_rt);
return err;
}
static void nsim_fib4_rt_remove(struct nsim_fib_data *data,
const struct fib_entry_notifier_info *fen_info)
{
struct netlink_ext_ack *extack = fen_info->info.extack;
struct nsim_fib4_rt *fib4_rt;
fib4_rt = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info);
if (WARN_ON_ONCE(!fib4_rt))
return;
rhashtable_remove_fast(&data->fib_rt_ht, &fib4_rt->common.ht_node,
nsim_fib_rt_ht_params);
nsim_fib_account(&data->ipv4.fib, false, extack);
nsim_fib4_rt_destroy(fib4_rt);
}
static int nsim_fib4_event(struct nsim_fib_data *data,
struct fib_notifier_info *info,
unsigned long event)
{
struct fib_entry_notifier_info *fen_info;
int err = 0;
fen_info = container_of(info, struct fib_entry_notifier_info, info);
if (fen_info->fi->nh) {
NL_SET_ERR_MSG_MOD(info->extack, "IPv4 route with nexthop objects is not supported");
return 0;
}
switch (event) {
case FIB_EVENT_ENTRY_REPLACE:
err = nsim_fib4_rt_insert(data, fen_info);
break;
case FIB_EVENT_ENTRY_DEL:
nsim_fib4_rt_remove(data, fen_info);
break;
default:
break;
}
return err;
}
static struct nsim_fib6_rt_nh *
nsim_fib6_rt_nh_find(const struct nsim_fib6_rt *fib6_rt,
const struct fib6_info *rt)
{
struct nsim_fib6_rt_nh *fib6_rt_nh;
list_for_each_entry(fib6_rt_nh, &fib6_rt->nh_list, list) {
if (fib6_rt_nh->rt == rt)
return fib6_rt_nh;
}
return NULL;
}
static int nsim_fib6_rt_nh_add(struct nsim_fib6_rt *fib6_rt,
struct fib6_info *rt)
{
struct nsim_fib6_rt_nh *fib6_rt_nh;
fib6_rt_nh = kzalloc(sizeof(*fib6_rt_nh), GFP_ATOMIC);
if (!fib6_rt_nh)
return -ENOMEM;
fib6_info_hold(rt);
fib6_rt_nh->rt = rt;
list_add_tail(&fib6_rt_nh->list, &fib6_rt->nh_list);
fib6_rt->nhs++;
return 0;
}
static void nsim_fib6_rt_nh_del(struct nsim_fib6_rt *fib6_rt,
const struct fib6_info *rt)
{
struct nsim_fib6_rt_nh *fib6_rt_nh;
fib6_rt_nh = nsim_fib6_rt_nh_find(fib6_rt, rt);
if (WARN_ON_ONCE(!fib6_rt_nh))
return;
fib6_rt->nhs--;
list_del(&fib6_rt_nh->list);
#if IS_ENABLED(CONFIG_IPV6)
fib6_info_release(fib6_rt_nh->rt);
#endif
kfree(fib6_rt_nh);
}
static struct nsim_fib6_rt *
nsim_fib6_rt_create(struct nsim_fib_data *data,
struct fib6_entry_notifier_info *fen6_info)
{
struct fib6_info *iter, *rt = fen6_info->rt;
struct nsim_fib6_rt *fib6_rt;
int i = 0;
int err;
fib6_rt = kzalloc(sizeof(*fib6_rt), GFP_ATOMIC);
if (!fib6_rt)
return ERR_PTR(-ENOMEM);
nsim_fib_rt_init(data, &fib6_rt->common, &rt->fib6_dst.addr,
sizeof(rt->fib6_dst.addr), rt->fib6_dst.plen, AF_INET6,
rt->fib6_table->tb6_id);
/* We consider a multipath IPv6 route as one entry, but it can be made
* up from several fib6_info structs (one for each nexthop), so we
* add them all to the same list under the entry.
*/
INIT_LIST_HEAD(&fib6_rt->nh_list);
err = nsim_fib6_rt_nh_add(fib6_rt, rt);
if (err)
goto err_fib_rt_fini;
if (!fen6_info->nsiblings)
return fib6_rt;
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
if (i == fen6_info->nsiblings)
break;
err = nsim_fib6_rt_nh_add(fib6_rt, iter);
if (err)
goto err_fib6_rt_nh_del;
i++;
}
WARN_ON_ONCE(i != fen6_info->nsiblings);
return fib6_rt;
err_fib6_rt_nh_del:
list_for_each_entry_continue_reverse(iter, &rt->fib6_siblings,
fib6_siblings)
nsim_fib6_rt_nh_del(fib6_rt, iter);
nsim_fib6_rt_nh_del(fib6_rt, rt);
err_fib_rt_fini:
nsim_fib_rt_fini(&fib6_rt->common);
kfree(fib6_rt);
return ERR_PTR(err);
}
static void nsim_fib6_rt_destroy(struct nsim_fib6_rt *fib6_rt)
{
struct nsim_fib6_rt_nh *iter, *tmp;
list_for_each_entry_safe(iter, tmp, &fib6_rt->nh_list, list)
nsim_fib6_rt_nh_del(fib6_rt, iter->rt);
WARN_ON_ONCE(!list_empty(&fib6_rt->nh_list));
nsim_fib_rt_fini(&fib6_rt->common);
kfree(fib6_rt);
}
static struct nsim_fib6_rt *
nsim_fib6_rt_lookup(struct rhashtable *fib_rt_ht, const struct fib6_info *rt)
{
struct nsim_fib_rt *fib_rt;
fib_rt = nsim_fib_rt_lookup(fib_rt_ht, &rt->fib6_dst.addr,
sizeof(rt->fib6_dst.addr),
rt->fib6_dst.plen, AF_INET6,
rt->fib6_table->tb6_id);
if (!fib_rt)
return NULL;
return container_of(fib_rt, struct nsim_fib6_rt, common);
}
static int nsim_fib6_rt_append(struct nsim_fib_data *data,
struct fib6_entry_notifier_info *fen6_info)
{
struct fib6_info *iter, *rt = fen6_info->rt;
struct nsim_fib6_rt *fib6_rt;
int i = 0;
int err;
fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, rt);
if (WARN_ON_ONCE(!fib6_rt))
return -EINVAL;
err = nsim_fib6_rt_nh_add(fib6_rt, rt);
if (err)
return err;
rt->trap = true;
if (!fen6_info->nsiblings)
return 0;
list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
if (i == fen6_info->nsiblings)
break;
err = nsim_fib6_rt_nh_add(fib6_rt, iter);
if (err)
goto err_fib6_rt_nh_del;
iter->trap = true;
i++;
}
WARN_ON_ONCE(i != fen6_info->nsiblings);
return 0;
err_fib6_rt_nh_del:
list_for_each_entry_continue_reverse(iter, &rt->fib6_siblings,
fib6_siblings) {
iter->trap = false;
nsim_fib6_rt_nh_del(fib6_rt, iter);
}
rt->trap = false;
nsim_fib6_rt_nh_del(fib6_rt, rt);
return err;
}
static void nsim_fib6_rt_hw_flags_set(const struct nsim_fib6_rt *fib6_rt,
bool trap)
{
struct nsim_fib6_rt_nh *fib6_rt_nh;
list_for_each_entry(fib6_rt_nh, &fib6_rt->nh_list, list)
fib6_info_hw_flags_set(fib6_rt_nh->rt, false, trap);
}
static int nsim_fib6_rt_add(struct nsim_fib_data *data,
struct nsim_fib6_rt *fib6_rt,
struct netlink_ext_ack *extack)
{
int err;
err = nsim_fib_account(&data->ipv6.fib, true, extack);
if (err)
return err;
err = rhashtable_insert_fast(&data->fib_rt_ht,
&fib6_rt->common.ht_node,
nsim_fib_rt_ht_params);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed to insert IPv6 route");
goto err_fib_dismiss;
}
nsim_fib6_rt_hw_flags_set(fib6_rt, true);
return 0;
err_fib_dismiss:
nsim_fib_account(&data->ipv6.fib, false, extack);
return err;
}
static int nsim_fib6_rt_replace(struct nsim_fib_data *data,
struct nsim_fib6_rt *fib6_rt,
struct nsim_fib6_rt *fib6_rt_old,
struct netlink_ext_ack *extack)
{
int err;
/* We are replacing a route, so no need to change the accounting. */
err = rhashtable_replace_fast(&data->fib_rt_ht,
&fib6_rt_old->common.ht_node,
&fib6_rt->common.ht_node,
nsim_fib_rt_ht_params);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed to replace IPv6 route");
return err;
}
nsim_fib6_rt_hw_flags_set(fib6_rt, true);
nsim_fib6_rt_hw_flags_set(fib6_rt_old, false);
nsim_fib6_rt_destroy(fib6_rt_old);
return 0;
}
static int nsim_fib6_rt_insert(struct nsim_fib_data *data,
struct fib6_entry_notifier_info *fen6_info)
{
struct netlink_ext_ack *extack = fen6_info->info.extack;
struct nsim_fib6_rt *fib6_rt, *fib6_rt_old;
int err;
fib6_rt = nsim_fib6_rt_create(data, fen6_info);
if (IS_ERR(fib6_rt))
return PTR_ERR(fib6_rt);
fib6_rt_old = nsim_fib6_rt_lookup(&data->fib_rt_ht, fen6_info->rt);
if (!fib6_rt_old)
err = nsim_fib6_rt_add(data, fib6_rt, extack);
else
err = nsim_fib6_rt_replace(data, fib6_rt, fib6_rt_old, extack);
if (err)
nsim_fib6_rt_destroy(fib6_rt);
return err;
}
static void
nsim_fib6_rt_remove(struct nsim_fib_data *data,
const struct fib6_entry_notifier_info *fen6_info)
{
struct netlink_ext_ack *extack = fen6_info->info.extack;
struct nsim_fib6_rt *fib6_rt;
/* Multipath routes are first added to the FIB trie and only then
* notified. If we vetoed the addition, we will get a delete
* notification for a route we do not have. Therefore, do not warn if
* route was not found.
*/
fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, fen6_info->rt);
if (!fib6_rt)
return;
/* If not all the nexthops are deleted, then only reduce the nexthop
* group.
*/
if (fen6_info->nsiblings + 1 != fib6_rt->nhs) {
nsim_fib6_rt_nh_del(fib6_rt, fen6_info->rt);
return;
}
rhashtable_remove_fast(&data->fib_rt_ht, &fib6_rt->common.ht_node,
nsim_fib_rt_ht_params);
nsim_fib_account(&data->ipv6.fib, false, extack);
nsim_fib6_rt_destroy(fib6_rt);
}
static int nsim_fib6_event(struct nsim_fib_data *data,
struct fib_notifier_info *info,
unsigned long event)
{
struct fib6_entry_notifier_info *fen6_info;
int err = 0;
fen6_info = container_of(info, struct fib6_entry_notifier_info, info);
if (fen6_info->rt->nh) {
NL_SET_ERR_MSG_MOD(info->extack, "IPv6 route with nexthop objects is not supported");
return 0;
}
if (fen6_info->rt->fib6_src.plen) {
NL_SET_ERR_MSG_MOD(info->extack, "IPv6 source-specific route is not supported");
return 0;
}
switch (event) {
case FIB_EVENT_ENTRY_REPLACE:
err = nsim_fib6_rt_insert(data, fen6_info);
break;
case FIB_EVENT_ENTRY_APPEND:
err = nsim_fib6_rt_append(data, fen6_info);
break;
case FIB_EVENT_ENTRY_DEL:
nsim_fib6_rt_remove(data, fen6_info);
break;
default:
break;
}
return err;
}
static int nsim_fib_event(struct nsim_fib_data *data,
struct fib_notifier_info *info, unsigned long event)
{
int err = 0;
switch (info->family) {
case AF_INET:
err = nsim_fib4_event(data, info, event);
break;
case AF_INET6:
err = nsim_fib6_event(data, info, event);
break;
}
return err;
}
static int nsim_fib_event_nb(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data,
fib_nb);
struct fib_notifier_info *info = ptr;
int err = 0;
/* IPv6 routes can be added via RAs from softIRQ. */
spin_lock_bh(&data->fib_lock);
switch (event) {
case FIB_EVENT_RULE_ADD: /* fall through */
case FIB_EVENT_RULE_DEL:
err = nsim_fib_rule_event(data, info,
event == FIB_EVENT_RULE_ADD);
break;
case FIB_EVENT_ENTRY_REPLACE: /* fall through */
case FIB_EVENT_ENTRY_APPEND: /* fall through */
case FIB_EVENT_ENTRY_DEL:
err = nsim_fib_event(data, info, event);
break;
}
spin_unlock_bh(&data->fib_lock);
return notifier_from_errno(err);
}
static void nsim_fib4_rt_free(struct nsim_fib_rt *fib_rt,
struct nsim_fib_data *data)
{
struct devlink *devlink = data->devlink;
struct nsim_fib4_rt *fib4_rt;
fib4_rt = container_of(fib_rt, struct nsim_fib4_rt, common);
nsim_fib4_rt_hw_flags_set(devlink_net(devlink), fib4_rt, false);
nsim_fib_account(&data->ipv4.fib, false, NULL);
nsim_fib4_rt_destroy(fib4_rt);
}
static void nsim_fib6_rt_free(struct nsim_fib_rt *fib_rt,
struct nsim_fib_data *data)
{
struct nsim_fib6_rt *fib6_rt;
fib6_rt = container_of(fib_rt, struct nsim_fib6_rt, common);
nsim_fib6_rt_hw_flags_set(fib6_rt, false);
nsim_fib_account(&data->ipv6.fib, false, NULL);
nsim_fib6_rt_destroy(fib6_rt);
}
static void nsim_fib_rt_free(void *ptr, void *arg)
{
struct nsim_fib_rt *fib_rt = ptr;
struct nsim_fib_data *data = arg;
switch (fib_rt->key.family) {
case AF_INET:
nsim_fib4_rt_free(fib_rt, data);
break;
case AF_INET6:
nsim_fib6_rt_free(fib_rt, data);
break;
default:
WARN_ON_ONCE(1);
}
}
/* inconsistent dump, trying again */
static void nsim_fib_dump_inconsistent(struct notifier_block *nb)
{
struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data,
fib_nb);
struct nsim_fib_rt *fib_rt, *fib_rt_tmp;
/* The notifier block is still not registered, so we do not need to
* take any locks here.
*/
list_for_each_entry_safe(fib_rt, fib_rt_tmp, &data->fib_rt_list, list) {
rhashtable_remove_fast(&data->fib_rt_ht, &fib_rt->ht_node,
nsim_fib_rt_ht_params);
nsim_fib_rt_free(fib_rt, data);
}
data->ipv4.rules.num = 0ULL;
data->ipv6.rules.num = 0ULL;
}
static u64 nsim_fib_ipv4_resource_occ_get(void *priv)
{
struct nsim_fib_data *data = priv;
return nsim_fib_get_val(data, NSIM_RESOURCE_IPV4_FIB, false);
}
static u64 nsim_fib_ipv4_rules_res_occ_get(void *priv)
{
struct nsim_fib_data *data = priv;
return nsim_fib_get_val(data, NSIM_RESOURCE_IPV4_FIB_RULES, false);
}
static u64 nsim_fib_ipv6_resource_occ_get(void *priv)
{
struct nsim_fib_data *data = priv;
return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB, false);
}
static u64 nsim_fib_ipv6_rules_res_occ_get(void *priv)
{
struct nsim_fib_data *data = priv;
return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB_RULES, false);
}
static void nsim_fib_set_max_all(struct nsim_fib_data *data,
struct devlink *devlink)
{
enum nsim_resource_id res_ids[] = {
NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
};
int i;
for (i = 0; i < ARRAY_SIZE(res_ids); i++) {
int err;
u64 val;
err = devlink_resource_size_get(devlink, res_ids[i], &val);
if (err)
val = (u64) -1;
nsim_fib_set_max(data, res_ids[i], val);
}
}
struct nsim_fib_data *nsim_fib_create(struct devlink *devlink,
struct netlink_ext_ack *extack)
{
struct nsim_fib_data *data;
int err;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return ERR_PTR(-ENOMEM);
data->devlink = devlink;
spin_lock_init(&data->fib_lock);
INIT_LIST_HEAD(&data->fib_rt_list);
err = rhashtable_init(&data->fib_rt_ht, &nsim_fib_rt_ht_params);
if (err)
goto err_data_free;
nsim_fib_set_max_all(data, devlink);
data->fib_nb.notifier_call = nsim_fib_event_nb;
err = register_fib_notifier(devlink_net(devlink), &data->fib_nb,
nsim_fib_dump_inconsistent, extack);
if (err) {
pr_err("Failed to register fib notifier\n");
goto err_rhashtable_destroy;
}
devlink_resource_occ_get_register(devlink,
NSIM_RESOURCE_IPV4_FIB,
nsim_fib_ipv4_resource_occ_get,
data);
devlink_resource_occ_get_register(devlink,
NSIM_RESOURCE_IPV4_FIB_RULES,
nsim_fib_ipv4_rules_res_occ_get,
data);
devlink_resource_occ_get_register(devlink,
NSIM_RESOURCE_IPV6_FIB,
nsim_fib_ipv6_resource_occ_get,
data);
devlink_resource_occ_get_register(devlink,
NSIM_RESOURCE_IPV6_FIB_RULES,
nsim_fib_ipv6_rules_res_occ_get,
data);
return data;
err_rhashtable_destroy:
rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free,
data);
err_data_free:
kfree(data);
return ERR_PTR(err);
}
void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *data)
{
devlink_resource_occ_get_unregister(devlink,
NSIM_RESOURCE_IPV6_FIB_RULES);
devlink_resource_occ_get_unregister(devlink,
NSIM_RESOURCE_IPV6_FIB);
devlink_resource_occ_get_unregister(devlink,
NSIM_RESOURCE_IPV4_FIB_RULES);
devlink_resource_occ_get_unregister(devlink,
NSIM_RESOURCE_IPV4_FIB);
unregister_fib_notifier(devlink_net(devlink), &data->fib_nb);
rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free,
data);
WARN_ON_ONCE(!list_empty(&data->fib_rt_list));
kfree(data);
}
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