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netfilter: nf_tables: add clone interface to expression operations

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With the conversion of the counter expressions to make it percpu, we
need to clone the percpu memory area, otherwise we crash when using
counters from flow tables.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2015-11-10 13:39:42 +01:00
parent aabc92bbe3
commit 086f332167
3 changed files with 58 additions and 12 deletions
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14
include/net/netfilter/nf_tables.h
View File

@ -618,6 +618,8 @@ struct nft_expr_ops {
void (*eval)(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt);
int (*clone)(struct nft_expr *dst,
const struct nft_expr *src);
unsigned int size;
int (*init)(const struct nft_ctx *ctx,
@ -660,11 +662,21 @@ void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
const struct nft_expr *expr);
static inline void nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
{
int err;
__module_get(src->ops->type->owner);
if (src->ops->clone) {
dst->ops = src->ops;
err = src->ops->clone(dst, src);
if (err < 0)
return err;
} else {
memcpy(dst, src, src->ops->size);
}
return 0;
}
/**
* struct nft_rule - nf_tables rule

49
net/netfilter/nft_counter.c
View File

@ -47,27 +47,34 @@ static void nft_counter_eval(const struct nft_expr *expr,
local_bh_enable();
}
static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
static void nft_counter_fetch(const struct nft_counter_percpu __percpu *counter,
struct nft_counter *total)
{
struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
struct nft_counter_percpu *cpu_stats;
struct nft_counter total;
const struct nft_counter_percpu *cpu_stats;
u64 bytes, packets;
unsigned int seq;
int cpu;
memset(&total, 0, sizeof(total));
memset(total, 0, sizeof(*total));
for_each_possible_cpu(cpu) {
cpu_stats = per_cpu_ptr(priv->counter, cpu);
cpu_stats = per_cpu_ptr(counter, cpu);
do {
seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
bytes = cpu_stats->counter.bytes;
packets = cpu_stats->counter.packets;
} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
total.packets += packets;
total.bytes += bytes;
total->packets += packets;
total->bytes += bytes;
}
}
static int nft_counter_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
struct nft_counter_percpu_priv *priv = nft_expr_priv(expr);
struct nft_counter total;
nft_counter_fetch(priv->counter, &total);
if (nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)) ||
nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.packets)))
@ -118,6 +125,31 @@ static void nft_counter_destroy(const struct nft_ctx *ctx,
free_percpu(priv->counter);
}
static int nft_counter_clone(struct nft_expr *dst, const struct nft_expr *src)
{
struct nft_counter_percpu_priv *priv = nft_expr_priv(src);
struct nft_counter_percpu_priv *priv_clone = nft_expr_priv(dst);
struct nft_counter_percpu __percpu *cpu_stats;
struct nft_counter_percpu *this_cpu;
struct nft_counter total;
nft_counter_fetch(priv->counter, &total);
cpu_stats = __netdev_alloc_pcpu_stats(struct nft_counter_percpu,
GFP_ATOMIC);
if (cpu_stats == NULL)
return ENOMEM;
preempt_disable();
this_cpu = this_cpu_ptr(cpu_stats);
this_cpu->counter.packets = total.packets;
this_cpu->counter.bytes = total.bytes;
preempt_enable();
priv_clone->counter = cpu_stats;
return 0;
}
static struct nft_expr_type nft_counter_type;
static const struct nft_expr_ops nft_counter_ops = {
.type = &nft_counter_type,
@ -126,6 +158,7 @@ static const struct nft_expr_ops nft_counter_ops = {
.init = nft_counter_init,
.destroy = nft_counter_destroy,
.dump = nft_counter_dump,
.clone = nft_counter_clone,
};
static struct nft_expr_type nft_counter_type __read_mostly = {

5
net/netfilter/nft_dynset.c
View File

@ -50,8 +50,9 @@ static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr,
}
ext = nft_set_elem_ext(set, elem);
if (priv->expr != NULL)
nft_expr_clone(nft_set_ext_expr(ext), priv->expr);
if (priv->expr != NULL &&
nft_expr_clone(nft_set_ext_expr(ext), priv->expr) < 0)
return NULL;
return elem;
}