The next change will merge skb->nfct pointer and skb->nfctinfo
status bits into single skb->_nfct (unsigned long) area.
For this to work nf_conn addresses must always be aligned at least on
an 8 byte boundary since we will need the lower 3bits to store nfctinfo.
Conntrack templates are allocated via kmalloc.
kbuild test robot reported
BUILD_BUG_ON failed: NFCT_INFOMASK >= ARCH_KMALLOC_MINALIGN
on v1 of this patchset, so not all platforms meet this requirement.
Do manual alignment if needed, the alignment offset is stored in the
nf_conn entry protocol area. This works because templates are not
handed off to L4 protocol trackers.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
const struct nf_conn *ignored_conntrack);
int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
const struct nf_conn *ignored_conntrack);
+#define NFCT_INFOMASK 7UL
+
/* Return conntrack_info and tuple hash for given skb. */
static inline struct nf_conn *
nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
/* Return conntrack_info and tuple hash for given skb. */
static inline struct nf_conn *
nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
spin_unlock(&pcpu->lock);
}
spin_unlock(&pcpu->lock);
}
+#define NFCT_ALIGN(len) (((len) + NFCT_INFOMASK) & ~NFCT_INFOMASK)
+
/* Released via destroy_conntrack() */
struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
const struct nf_conntrack_zone *zone,
gfp_t flags)
{
/* Released via destroy_conntrack() */
struct nf_conn *nf_ct_tmpl_alloc(struct net *net,
const struct nf_conntrack_zone *zone,
gfp_t flags)
{
+ struct nf_conn *tmpl, *p;
- tmpl = kzalloc(sizeof(*tmpl), flags);
- if (tmpl == NULL)
- return NULL;
+ if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK) {
+ tmpl = kzalloc(sizeof(*tmpl) + NFCT_INFOMASK, flags);
+ if (!tmpl)
+ return NULL;
+
+ p = tmpl;
+ tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p);
+ if (tmpl != p) {
+ tmpl = (struct nf_conn *)NFCT_ALIGN((unsigned long)p);
+ tmpl->proto.tmpl_padto = (char *)tmpl - (char *)p;
+ }
+ } else {
+ tmpl = kzalloc(sizeof(*tmpl), flags);
+ if (!tmpl)
+ return NULL;
+ }
tmpl->status = IPS_TEMPLATE;
write_pnet(&tmpl->ct_net, net);
tmpl->status = IPS_TEMPLATE;
write_pnet(&tmpl->ct_net, net);
{
nf_ct_ext_destroy(tmpl);
nf_ct_ext_free(tmpl);
{
nf_ct_ext_destroy(tmpl);
nf_ct_ext_free(tmpl);
+
+ if (ARCH_KMALLOC_MINALIGN <= NFCT_INFOMASK)
+ kfree((char *)tmpl - tmpl->proto.tmpl_padto);
+ else
+ kfree(tmpl);
}
EXPORT_SYMBOL_GPL(nf_ct_tmpl_free);
}
EXPORT_SYMBOL_GPL(nf_ct_tmpl_free);