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| author | Holger Eitzenberger <holger@eitzenberger.org> | 2009-03-25 18:24:48 +0100 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2009-03-25 18:24:48 +0100 |
| commit | d0dba7255b541f1651a88e75ebdb20dd45509c2f (patch) | |
| tree | db731388062d6b81e73bc9328fdd29e6eb81c509 /net | |
| parent | b8dfe498775de912116f275680ddb57c8799d9ef (diff) | |
| download | linux-stable-d0dba7255b541f1651a88e75ebdb20dd45509c2f.tar.gz linux-stable-d0dba7255b541f1651a88e75ebdb20dd45509c2f.tar.bz2 linux-stable-d0dba7255b541f1651a88e75ebdb20dd45509c2f.zip | |
netfilter: ctnetlink: add callbacks to the per-proto nlattrs
There is added a single callback for the l3 proto helper. The two
callbacks for the l4 protos are necessary because of the general
structure of a ctnetlink event, which is in short:
CTA_TUPLE_ORIG
<l3/l4-proto-attributes>
CTA_TUPLE_REPLY
<l3/l4-proto-attributes>
CTA_ID
...
CTA_PROTOINFO
<l4-proto-attributes>
CTA_TUPLE_MASTER
<l3/l4-proto-attributes>
Therefore the formular is
size := sizeof(generic-nlas) + 3 * sizeof(tuple_nlas) + sizeof(protoinfo_nlas)
Some of the NLAs are optional, e. g. CTA_TUPLE_MASTER, which is only
set if it's an expected connection. But the number of optional NLAs is
small enough to prevent netlink_trim() from reallocating if calculated
properly.
Signed-off-by: Holger Eitzenberger <holger@eitzenberger.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nf_conntrack_proto.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c index 9a62b4efa0e1..1a4568bf7ea5 100644 --- a/net/netfilter/nf_conntrack_proto.c +++ b/net/netfilter/nf_conntrack_proto.c @@ -167,6 +167,9 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) if (proto->l3proto >= AF_MAX) return -EBUSY; + if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size) + return -EINVAL; + mutex_lock(&nf_ct_proto_mutex); if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) { ret = -EBUSY; @@ -177,6 +180,9 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto) if (ret < 0) goto out_unlock; + if (proto->nlattr_tuple_size) + proto->nla_size = 3 * proto->nlattr_tuple_size(); + rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto); out_unlock: @@ -263,6 +269,10 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) if (l4proto->l3proto >= PF_MAX) return -EBUSY; + if ((l4proto->to_nlattr && !l4proto->nlattr_size) + || (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size)) + return -EINVAL; + mutex_lock(&nf_ct_proto_mutex); if (!nf_ct_protos[l4proto->l3proto]) { /* l3proto may be loaded latter. */ @@ -290,6 +300,12 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto) if (ret < 0) goto out_unlock; + l4proto->nla_size = 0; + if (l4proto->nlattr_size) + l4proto->nla_size += l4proto->nlattr_size(); + if (l4proto->nlattr_tuple_size) + l4proto->nla_size += 3 * l4proto->nlattr_tuple_size(); + rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto], l4proto); |