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netfilter: nft_set_pipapo: shrink data structures 

The set uses a mix of 'int', 'unsigned int', and size_t.

The rule count limit is NFT_PIPAPO_RULE0_MAX, which cannot
exceed INT_MAX (a few helpers use 'int' as return type).

Add a compile-time assertion for this.

Replace size_t usage in structs with unsigned int or u8 where
the stored values are smaller.

Replace signed-int arguments for lengths with 'unsigned int'
where possible.

Last, remove lt_aligned member: its set but never read.

struct nft_pipapo_match 40 bytes -> 32 bytes
struct nft_pipapo_field 56 bytes -> 32 bytes

Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Florian Westphal 2024-02-13 16:23:39 +01:00
parent 07ace0bbe0
commit aac14d516c
2 changed files with 51 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
net/netfilter/nft_set_pipapo.c
View File

@ -359,11 +359,13 @@
*
* Return: -1 on no match, bit position on 'match_only', 0 otherwise.
*/
int pipapo_refill(unsigned long *map, int len, int rules, unsigned long *dst,
int pipapo_refill(unsigned long *map, unsigned int len, unsigned int rules,
unsigned long *dst,
const union nft_pipapo_map_bucket *mt, bool match_only)
{
unsigned long bitset;
int k, ret = -1;
unsigned int k;
int ret = -1;
for (k = 0; k < len; k++) {
bitset = map[k];
@ -631,13 +633,17 @@ nft_pipapo_get(const struct net *net, const struct nft_set *set,
*
* Return: 0 on success, -ENOMEM on allocation failure.
*/
static int pipapo_resize(struct nft_pipapo_field *f, int old_rules, int rules)
static int pipapo_resize(struct nft_pipapo_field *f,
unsigned int old_rules, unsigned int rules)
{
long *new_lt = NULL, *new_p, *old_lt = f->lt, *old_p;
union nft_pipapo_map_bucket *new_mt, *old_mt = f->mt;
size_t new_bucket_size, copy;
unsigned int new_bucket_size, copy;
int group, bucket;
if (rules >= NFT_PIPAPO_RULE0_MAX)
return -ENOSPC;
new_bucket_size = DIV_ROUND_UP(rules, BITS_PER_LONG);
#ifdef NFT_PIPAPO_ALIGN
new_bucket_size = roundup(new_bucket_size,
@ -690,7 +696,7 @@ mt:
if (new_lt) {
f->bsize = new_bucket_size;
NFT_PIPAPO_LT_ASSIGN(f, new_lt);
f->lt = new_lt;
kvfree(old_lt);
}
@ -847,8 +853,8 @@ static void pipapo_lt_8b_to_4b(int old_groups, int bsize,
*/
static void pipapo_lt_bits_adjust(struct nft_pipapo_field *f)
{
unsigned int groups, bb;
unsigned long *new_lt;
int groups, bb;
size_t lt_size;
lt_size = f->groups * NFT_PIPAPO_BUCKETS(f->bb) * f->bsize *
@ -898,7 +904,7 @@ static void pipapo_lt_bits_adjust(struct nft_pipapo_field *f)
f->groups = groups;
f->bb = bb;
kvfree(f->lt);
NFT_PIPAPO_LT_ASSIGN(f, new_lt);
f->lt = new_lt;
}
/**
@ -915,7 +921,7 @@ static void pipapo_lt_bits_adjust(struct nft_pipapo_field *f)
static int pipapo_insert(struct nft_pipapo_field *f, const uint8_t *k,
int mask_bits)
{
int rule = f->rules, group, ret, bit_offset = 0;
unsigned int rule = f->rules, group, ret, bit_offset = 0;
ret = pipapo_resize(f, f->rules, f->rules + 1);
if (ret)
@ -1255,8 +1261,14 @@ static int nft_pipapo_insert(const struct net *net, const struct nft_set *set,
/* Validate */
start_p = start;
end_p = end;
/* some helpers return -1, or 0 >= for valid rule pos,
* so we cannot support more than INT_MAX rules at this time.
*/
BUILD_BUG_ON(NFT_PIPAPO_RULE0_MAX > INT_MAX);
nft_pipapo_for_each_field(f, i, m) {
if (f->rules >= (unsigned long)NFT_PIPAPO_RULE0_MAX)
if (f->rules >= NFT_PIPAPO_RULE0_MAX)
return -ENOSPC;
if (memcmp(start_p, end_p,
@ -1362,7 +1374,7 @@ static struct nft_pipapo_match *pipapo_clone(struct nft_pipapo_match *old)
if (!new_lt)
goto out_lt;
NFT_PIPAPO_LT_ASSIGN(dst, new_lt);
dst->lt = new_lt;
memcpy(NFT_PIPAPO_LT_ALIGN(new_lt),
NFT_PIPAPO_LT_ALIGN(src->lt),
@ -1433,10 +1445,10 @@ out_scratch:
*
* Return: Number of rules that originated from the same entry as @first.
*/
static int pipapo_rules_same_key(struct nft_pipapo_field *f, int first)
static unsigned int pipapo_rules_same_key(struct nft_pipapo_field *f, unsigned int first)
{
struct nft_pipapo_elem *e = NULL; /* Keep gcc happy */
int r;
unsigned int r;
for (r = first; r < f->rules; r++) {
if (r != first && e != f->mt[r].e)
@ -1489,8 +1501,9 @@ static int pipapo_rules_same_key(struct nft_pipapo_field *f, int first)
* 0 1 2
* element pointers: 0x42 0x42 0x44
*/
static void pipapo_unmap(union nft_pipapo_map_bucket *mt, int rules,
int start, int n, int to_offset, bool is_last)
static void pipapo_unmap(union nft_pipapo_map_bucket *mt, unsigned int rules,
unsigned int start, unsigned int n,
unsigned int to_offset, bool is_last)
{
int i;
@ -1596,8 +1609,8 @@ static void pipapo_gc(struct nft_set *set, struct nft_pipapo_match *m)
{
struct nft_pipapo *priv = nft_set_priv(set);
struct net *net = read_pnet(&set->net);
unsigned int rules_f0, first_rule = 0;
u64 tstamp = nft_net_tstamp(net);
int rules_f0, first_rule = 0;
struct nft_pipapo_elem *e;
struct nft_trans_gc *gc;
@ -1608,7 +1621,7 @@ static void pipapo_gc(struct nft_set *set, struct nft_pipapo_match *m)
while ((rules_f0 = pipapo_rules_same_key(m->f, first_rule))) {
union nft_pipapo_map_bucket rulemap[NFT_PIPAPO_MAX_FIELDS];
const struct nft_pipapo_field *f;
int i, start, rules_fx;
unsigned int i, start, rules_fx;
start = first_rule;
rules_fx = rules_f0;
@ -1986,7 +1999,7 @@ static void nft_pipapo_remove(const struct net *net, const struct nft_set *set,
{
struct nft_pipapo *priv = nft_set_priv(set);
struct nft_pipapo_match *m = priv->clone;
int rules_f0, first_rule = 0;
unsigned int rules_f0, first_rule = 0;
struct nft_pipapo_elem *e;
const u8 *data;
@ -2051,7 +2064,7 @@ static void nft_pipapo_walk(const struct nft_ctx *ctx, struct nft_set *set,
struct net *net = read_pnet(&set->net);
const struct nft_pipapo_match *m;
const struct nft_pipapo_field *f;
int i, r;
unsigned int i, r;
rcu_read_lock();
if (iter->genmask == nft_genmask_cur(net))
@ -2155,6 +2168,9 @@ static int nft_pipapo_init(const struct nft_set *set,
field_count = desc->field_count ? : 1;
BUILD_BUG_ON(NFT_PIPAPO_MAX_FIELDS > 255);
BUILD_BUG_ON(NFT_PIPAPO_MAX_FIELDS != NFT_REG32_COUNT);
if (field_count > NFT_PIPAPO_MAX_FIELDS)
return -EINVAL;
@ -2176,7 +2192,11 @@ static int nft_pipapo_init(const struct nft_set *set,
rcu_head_init(&m->rcu);
nft_pipapo_for_each_field(f, i, m) {
int len = desc->field_len[i] ? : set->klen;
unsigned int len = desc->field_len[i] ? : set->klen;
/* f->groups is u8 */
BUILD_BUG_ON((NFT_PIPAPO_MAX_BYTES *
BITS_PER_BYTE / NFT_PIPAPO_GROUP_BITS_LARGE_SET) >= 256);
f->bb = NFT_PIPAPO_GROUP_BITS_INIT;
f->groups = len * NFT_PIPAPO_GROUPS_PER_BYTE(f);
@ -2185,7 +2205,7 @@ static int nft_pipapo_init(const struct nft_set *set,
f->bsize = 0;
f->rules = 0;
NFT_PIPAPO_LT_ASSIGN(f, NULL);
f->lt = NULL;
f->mt = NULL;
}
@ -2221,7 +2241,7 @@ static void nft_set_pipapo_match_destroy(const struct nft_ctx *ctx,
struct nft_pipapo_match *m)
{
struct nft_pipapo_field *f;
int i, r;
unsigned int i, r;
for (i = 0, f = m->f; i < m->field_count - 1; i++, f++)
;

29
net/netfilter/nft_set_pipapo.h
View File

@ -70,15 +70,9 @@
#define NFT_PIPAPO_ALIGN_HEADROOM \
(NFT_PIPAPO_ALIGN - ARCH_KMALLOC_MINALIGN)
#define NFT_PIPAPO_LT_ALIGN(lt) (PTR_ALIGN((lt), NFT_PIPAPO_ALIGN))
#define NFT_PIPAPO_LT_ASSIGN(field, x) \
do { \
(field)->lt_aligned = NFT_PIPAPO_LT_ALIGN(x); \
(field)->lt = (x); \
} while (0)
#else
#define NFT_PIPAPO_ALIGN_HEADROOM 0
#define NFT_PIPAPO_LT_ALIGN(lt) (lt)
#define NFT_PIPAPO_LT_ASSIGN(field, x) ((field)->lt = (x))
#endif /* NFT_PIPAPO_ALIGN */
#define nft_pipapo_for_each_field(field, index, match) \
@ -110,22 +104,18 @@ union nft_pipapo_map_bucket {
/**
* struct nft_pipapo_field - Lookup, mapping tables and related data for a field
* @groups: Amount of bit groups
* @rules: Number of inserted rules
* @bsize: Size of each bucket in lookup table, in longs
* @groups: Amount of bit groups
* @bb: Number of bits grouped together in lookup table buckets
* @lt: Lookup table: 'groups' rows of buckets
* @lt_aligned: Version of @lt aligned to NFT_PIPAPO_ALIGN bytes
* @mt: Mapping table: one bucket per rule
*/
struct nft_pipapo_field {
int groups;
unsigned long rules;
size_t bsize;
int bb;
#ifdef NFT_PIPAPO_ALIGN
unsigned long *lt_aligned;
#endif
unsigned int rules;
unsigned int bsize;
u8 groups;
u8 bb;
unsigned long *lt;
union nft_pipapo_map_bucket *mt;
};
@ -145,15 +135,15 @@ struct nft_pipapo_scratch {
/**
* struct nft_pipapo_match - Data used for lookup and matching
* @field_count: Amount of fields in set
* @scratch: Preallocated per-CPU maps for partial matching results
* @bsize_max: Maximum lookup table bucket size of all fields, in longs
* @scratch: Preallocated per-CPU maps for partial matching results
* @rcu: Matching data is swapped on commits
* @f: Fields, with lookup and mapping tables
*/
struct nft_pipapo_match {
int field_count;
u8 field_count;
unsigned int bsize_max;
struct nft_pipapo_scratch * __percpu *scratch;
size_t bsize_max;
struct rcu_head rcu;
struct nft_pipapo_field f[] __counted_by(field_count);
};
@ -186,7 +176,8 @@ struct nft_pipapo_elem {
struct nft_set_ext ext;
};
int pipapo_refill(unsigned long *map, int len, int rules, unsigned long *dst,
int pipapo_refill(unsigned long *map, unsigned int len, unsigned int rules,
unsigned long *dst,
const union nft_pipapo_map_bucket *mt, bool match_only);
/**