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// SPDX-License-Identifier: GPL-2.0
#include <linux/jhash.h>
#include <linux/netfilter.h>
#include <linux/rcupdate.h>
#include <linux/rhashtable.h>
#include <linux/vmalloc.h>
#include <net/genetlink.h>
#include <net/ila.h>
#include <net/netns/generic.h>
#include <uapi/linux/genetlink.h>
#include "ila.h"
struct ila_xlat_params {
struct ila_params ip;
int ifindex;
};
struct ila_map {
struct ila_xlat_params xp;
struct rhash_head node;
struct ila_map __rcu *next;
struct rcu_head rcu;
};
static unsigned int ila_net_id;
struct ila_net {
struct rhashtable rhash_table;
spinlock_t *locks; /* Bucket locks for entry manipulation */
unsigned int locks_mask;
bool hooks_registered;
};
#define LOCKS_PER_CPU 10
static int alloc_ila_locks(struct ila_net *ilan)
{
unsigned int i, size;
unsigned int nr_pcpus = num_possible_cpus();
nr_pcpus = min_t(unsigned int, nr_pcpus, 32UL);
size = roundup_pow_of_two(nr_pcpus * LOCKS_PER_CPU);
if (sizeof(spinlock_t) != 0) {
ilan->locks = kvmalloc(size * sizeof(spinlock_t), GFP_KERNEL);
if (!ilan->locks)
return -ENOMEM;
for (i = 0; i < size; i++)
spin_lock_init(&ilan->locks[i]);
}
ilan->locks_mask = size - 1;
return 0;
}
static u32 hashrnd __read_mostly;
static __always_inline void __ila_hash_secret_init(void)
{
net_get_random_once(&hashrnd, sizeof(hashrnd));
}
static inline u32 ila_locator_hash(struct ila_locator loc)
{
u32 *v = (u32 *)loc.v32;
__ila_hash_secret_init();
return jhash_2words(v[0], v[1], hashrnd);
}
static inline spinlock_t *ila_get_lock(struct ila_net *ilan,
struct ila_locator loc)
{
return &ilan->locks[ila_locator_hash(loc) & ilan->locks_mask];
}
static inline int ila_cmp_wildcards(struct ila_map *ila,
struct ila_addr *iaddr, int ifindex)
{
return (ila->xp.ifindex && ila->xp.ifindex != ifindex);
}
static inline int ila_cmp_params(struct ila_map *ila,
struct ila_xlat_params *xp)
{
return (ila->xp.ifindex != xp->ifindex);
}
static int ila_cmpfn(struct rhashtable_compare_arg *arg,
const void *obj)
{
const struct ila_map *ila = obj;
return (ila->xp.ip.locator_match.v64 != *(__be64 *)arg->key);
}
static inline int ila_order(struct ila_map *ila)
{
int score = 0;
if (ila->xp.ifindex)
score += 1 << 1;
return score;
}
static const struct rhashtable_params rht_params = {
.nelem_hint = 1024,
.head_offset = offsetof(struct ila_map, node),
.key_offset = offsetof(struct ila_map, xp.ip.locator_match),
.key_len = sizeof(u64), /* identifier */
.max_size = 1048576,
.min_size = 256,
.automatic_shrinking = true,
.obj_cmpfn = ila_cmpfn,
};
static struct genl_family ila_nl_family;
static const struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
[ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
[ILA_ATTR_LOCATOR_MATCH] = { .type = NLA_U64, },
[ILA_ATTR_IFINDEX] = { .type = NLA_U32, },
[ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, },
};
static int parse_nl_config(struct genl_info *info,
struct ila_xlat_params *xp)
{
memset(xp, 0, sizeof(*xp));
if (info->attrs[ILA_ATTR_LOCATOR])
xp->ip.locator.v64 = (__force __be64)nla_get_u64(
info->attrs[ILA_ATTR_LOCATOR]);
if (info->attrs[ILA_ATTR_LOCATOR_MATCH])
xp->ip.locator_match.v64 = (__force __be64)nla_get_u64(
info->attrs[ILA_ATTR_LOCATOR_MATCH]);
if (info->attrs[ILA_ATTR_CSUM_MODE])
xp->ip.csum_mode = nla_get_u8(info->attrs[ILA_ATTR_CSUM_MODE]);
if (info->attrs[ILA_ATTR_IFINDEX])
xp->ifindex = nla_get_s32(info->attrs[ILA_ATTR_IFINDEX]);
return 0;
}
/* Must be called with rcu readlock */
static inline struct ila_map *ila_lookup_wildcards(struct ila_addr *iaddr,
int ifindex,
struct ila_net *ilan)
{
struct ila_map *ila;
ila = rhashtable_lookup_fast(&ilan->rhash_table, &iaddr->loc,
rht_params);
while (ila) {
if (!ila_cmp_wildcards(ila, iaddr, ifindex))
return ila;
ila = rcu_access_pointer(ila->next);
}
return NULL;
}
/* Must be called with rcu readlock */
static inline struct ila_map *ila_lookup_by_params(struct ila_xlat_params *xp,
struct ila_net *ilan)
{
struct ila_map *ila;
ila = rhashtable_lookup_fast(&ilan->rhash_table,
&xp->ip.locator_match,
rht_params);
while (ila) {
if (!ila_cmp_params(ila, xp))
return ila;
ila = rcu_access_pointer(ila->next);
}
return NULL;
}
static inline void ila_release(struct ila_map *ila)
{
kfree_rcu(ila, rcu);
}
static void ila_free_cb(void *ptr, void *arg)
{
struct ila_map *ila = (struct ila_map *)ptr, *next;
/* Assume rcu_readlock held */
while (ila) {
next = rcu_acc
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