1195 lines
29 KiB
C
1195 lines
29 KiB
C
/*
|
|
* 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 <net/nexthop.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 nsim_fib_entry nexthops;
|
|
struct rhashtable fib_rt_ht;
|
|
struct list_head fib_rt_list;
|
|
spinlock_t fib_lock; /* Protects hashtable, list and accounting */
|
|
struct notifier_block nexthop_nb;
|
|
struct rhashtable nexthop_ht;
|
|
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,
|
|
};
|
|
|
|
struct nsim_nexthop {
|
|
struct rhash_head ht_node;
|
|
u64 occ;
|
|
u32 id;
|
|
};
|
|
|
|
static const struct rhashtable_params nsim_nexthop_ht_params = {
|
|
.key_offset = offsetof(struct nsim_nexthop, id),
|
|
.head_offset = offsetof(struct nsim_nexthop, ht_node),
|
|
.key_len = sizeof(u32),
|
|
.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;
|
|
case NSIM_RESOURCE_NEXTHOPS:
|
|
entry = &fib_data->nexthops;
|
|
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;
|
|
case NSIM_RESOURCE_NEXTHOPS:
|
|
entry = &fib_data->nexthops;
|
|
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);
|
|
|
|
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->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:
|
|
case FIB_EVENT_RULE_DEL:
|
|
err = nsim_fib_rule_event(data, info,
|
|
event == FIB_EVENT_RULE_ADD);
|
|
break;
|
|
|
|
case FIB_EVENT_ENTRY_REPLACE:
|
|
case FIB_EVENT_ENTRY_APPEND:
|
|
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 struct nsim_nexthop *nsim_nexthop_create(struct nsim_fib_data *data,
|
|
struct nh_notifier_info *info)
|
|
{
|
|
struct nsim_nexthop *nexthop;
|
|
u64 occ = 0;
|
|
int i;
|
|
|
|
nexthop = kzalloc(sizeof(*nexthop), GFP_KERNEL);
|
|
if (!nexthop)
|
|
return NULL;
|
|
|
|
nexthop->id = info->id;
|
|
|
|
/* Determine the number of nexthop entries the new nexthop will
|
|
* occupy.
|
|
*/
|
|
|
|
if (!info->is_grp) {
|
|
occ = 1;
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < info->nh_grp->num_nh; i++)
|
|
occ += info->nh_grp->nh_entries[i].weight;
|
|
|
|
out:
|
|
nexthop->occ = occ;
|
|
return nexthop;
|
|
}
|
|
|
|
static void nsim_nexthop_destroy(struct nsim_nexthop *nexthop)
|
|
{
|
|
kfree(nexthop);
|
|
}
|
|
|
|
static int nsim_nexthop_account(struct nsim_fib_data *data, u64 occ,
|
|
bool add, struct netlink_ext_ack *extack)
|
|
{
|
|
int err = 0;
|
|
|
|
if (add) {
|
|
if (data->nexthops.num + occ <= data->nexthops.max) {
|
|
data->nexthops.num += occ;
|
|
} else {
|
|
err = -ENOSPC;
|
|
NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported nexthops");
|
|
}
|
|
} else {
|
|
if (WARN_ON(occ > data->nexthops.num))
|
|
return -EINVAL;
|
|
data->nexthops.num -= occ;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int nsim_nexthop_add(struct nsim_fib_data *data,
|
|
struct nsim_nexthop *nexthop,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = devlink_net(data->devlink);
|
|
int err;
|
|
|
|
err = nsim_nexthop_account(data, nexthop->occ, true, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
err = rhashtable_insert_fast(&data->nexthop_ht, &nexthop->ht_node,
|
|
nsim_nexthop_ht_params);
|
|
if (err) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Failed to insert nexthop");
|
|
goto err_nexthop_dismiss;
|
|
}
|
|
|
|
nexthop_set_hw_flags(net, nexthop->id, false, true);
|
|
|
|
return 0;
|
|
|
|
err_nexthop_dismiss:
|
|
nsim_nexthop_account(data, nexthop->occ, false, extack);
|
|
return err;
|
|
}
|
|
|
|
static int nsim_nexthop_replace(struct nsim_fib_data *data,
|
|
struct nsim_nexthop *nexthop,
|
|
struct nsim_nexthop *nexthop_old,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = devlink_net(data->devlink);
|
|
int err;
|
|
|
|
err = nsim_nexthop_account(data, nexthop->occ, true, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
err = rhashtable_replace_fast(&data->nexthop_ht,
|
|
&nexthop_old->ht_node, &nexthop->ht_node,
|
|
nsim_nexthop_ht_params);
|
|
if (err) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Failed to replace nexthop");
|
|
goto err_nexthop_dismiss;
|
|
}
|
|
|
|
nexthop_set_hw_flags(net, nexthop->id, false, true);
|
|
nsim_nexthop_account(data, nexthop_old->occ, false, extack);
|
|
nsim_nexthop_destroy(nexthop_old);
|
|
|
|
return 0;
|
|
|
|
err_nexthop_dismiss:
|
|
nsim_nexthop_account(data, nexthop->occ, false, extack);
|
|
return err;
|
|
}
|
|
|
|
static int nsim_nexthop_insert(struct nsim_fib_data *data,
|
|
struct nh_notifier_info *info)
|
|
{
|
|
struct nsim_nexthop *nexthop, *nexthop_old;
|
|
int err;
|
|
|
|
nexthop = nsim_nexthop_create(data, info);
|
|
if (!nexthop)
|
|
return -ENOMEM;
|
|
|
|
nexthop_old = rhashtable_lookup_fast(&data->nexthop_ht, &info->id,
|
|
nsim_nexthop_ht_params);
|
|
if (!nexthop_old)
|
|
err = nsim_nexthop_add(data, nexthop, info->extack);
|
|
else
|
|
err = nsim_nexthop_replace(data, nexthop, nexthop_old,
|
|
info->extack);
|
|
|
|
if (err)
|
|
nsim_nexthop_destroy(nexthop);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void nsim_nexthop_remove(struct nsim_fib_data *data,
|
|
struct nh_notifier_info *info)
|
|
{
|
|
struct nsim_nexthop *nexthop;
|
|
|
|
nexthop = rhashtable_lookup_fast(&data->nexthop_ht, &info->id,
|
|
nsim_nexthop_ht_params);
|
|
if (!nexthop)
|
|
return;
|
|
|
|
rhashtable_remove_fast(&data->nexthop_ht, &nexthop->ht_node,
|
|
nsim_nexthop_ht_params);
|
|
nsim_nexthop_account(data, nexthop->occ, false, info->extack);
|
|
nsim_nexthop_destroy(nexthop);
|
|
}
|
|
|
|
static int nsim_nexthop_event_nb(struct notifier_block *nb, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data,
|
|
nexthop_nb);
|
|
struct nh_notifier_info *info = ptr;
|
|
int err = 0;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
switch (event) {
|
|
case NEXTHOP_EVENT_REPLACE:
|
|
err = nsim_nexthop_insert(data, info);
|
|
break;
|
|
case NEXTHOP_EVENT_DEL:
|
|
nsim_nexthop_remove(data, info);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return notifier_from_errno(err);
|
|
}
|
|
|
|
static void nsim_nexthop_free(void *ptr, void *arg)
|
|
{
|
|
struct nsim_nexthop *nexthop = ptr;
|
|
struct nsim_fib_data *data = arg;
|
|
struct net *net;
|
|
|
|
net = devlink_net(data->devlink);
|
|
nexthop_set_hw_flags(net, nexthop->id, false, false);
|
|
nsim_nexthop_account(data, nexthop->occ, false, NULL);
|
|
nsim_nexthop_destroy(nexthop);
|
|
}
|
|
|
|
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 u64 nsim_fib_nexthops_res_occ_get(void *priv)
|
|
{
|
|
struct nsim_fib_data *data = priv;
|
|
|
|
return nsim_fib_get_val(data, NSIM_RESOURCE_NEXTHOPS, 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,
|
|
NSIM_RESOURCE_NEXTHOPS,
|
|
};
|
|
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;
|
|
|
|
err = rhashtable_init(&data->nexthop_ht, &nsim_nexthop_ht_params);
|
|
if (err)
|
|
goto err_data_free;
|
|
|
|
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_rhashtable_nexthop_destroy;
|
|
|
|
nsim_fib_set_max_all(data, devlink);
|
|
|
|
data->nexthop_nb.notifier_call = nsim_nexthop_event_nb;
|
|
err = register_nexthop_notifier(devlink_net(devlink), &data->nexthop_nb,
|
|
extack);
|
|
if (err) {
|
|
pr_err("Failed to register nexthop notifier\n");
|
|
goto err_rhashtable_fib_destroy;
|
|
}
|
|
|
|
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_nexthop_nb_unregister;
|
|
}
|
|
|
|
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);
|
|
devlink_resource_occ_get_register(devlink,
|
|
NSIM_RESOURCE_NEXTHOPS,
|
|
nsim_fib_nexthops_res_occ_get,
|
|
data);
|
|
return data;
|
|
|
|
err_nexthop_nb_unregister:
|
|
unregister_nexthop_notifier(devlink_net(devlink), &data->nexthop_nb);
|
|
err_rhashtable_fib_destroy:
|
|
rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free,
|
|
data);
|
|
err_rhashtable_nexthop_destroy:
|
|
rhashtable_free_and_destroy(&data->nexthop_ht, nsim_nexthop_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_NEXTHOPS);
|
|
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);
|
|
unregister_nexthop_notifier(devlink_net(devlink), &data->nexthop_nb);
|
|
rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free,
|
|
data);
|
|
rhashtable_free_and_destroy(&data->nexthop_ht, nsim_nexthop_free,
|
|
data);
|
|
WARN_ON_ONCE(!list_empty(&data->fib_rt_list));
|
|
kfree(data);
|
|
}
|