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netfilter: ctnetlink: cleanup message-size calculation

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This patch cleans up the message calculation to make it similar
to rtnetlink, moreover, it removes unneeded verbose information.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2009-06-02 20:08:27 +02:00 committed by pablo
parent 96bcf938dc
commit 03b64f518a
1 changed files with 41 additions and 63 deletions
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104
net/netfilter/nf_conntrack_netlink.c
View file

@ -403,76 +403,55 @@ nla_put_failure:
}
#ifdef CONFIG_NF_CONNTRACK_EVENTS
/*
* The general structure of a ctnetlink event is
*
* 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(headers) + sizeof(generic_nlas) + 3 * sizeof(tuple_nlas)
* + sizeof(protoinfo_nlas)
*/
static struct sk_buff *
ctnetlink_alloc_skb(const struct nf_conntrack_tuple *tuple, gfp_t gfp)
static inline size_t
ctnetlink_proto_size(const struct nf_conn *ct)
{
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_l4proto *l4proto;
int len;
#define NLA_TYPE_SIZE(type) nla_total_size(sizeof(type))
/* proto independant part */
len = NLMSG_ALIGN(sizeof(struct nfgenmsg))
+ 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
+ 3 * nla_total_size(0) /* CTA_TUPLE_IP */
+ 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
+ 3 * NLA_TYPE_SIZE(u_int8_t) /* CTA_PROTO_NUM */
+ NLA_TYPE_SIZE(u_int32_t) /* CTA_ID */
+ NLA_TYPE_SIZE(u_int32_t) /* CTA_STATUS */
#ifdef CONFIG_NF_CT_ACCT
+ 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
+ 2 * NLA_TYPE_SIZE(uint64_t) /* CTA_COUNTERS_PACKETS */
+ 2 * NLA_TYPE_SIZE(uint64_t) /* CTA_COUNTERS_BYTES */
#endif
+ NLA_TYPE_SIZE(u_int32_t) /* CTA_TIMEOUT */
+ nla_total_size(0) /* CTA_PROTOINFO */
+ nla_total_size(0) /* CTA_HELP */
+ nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
#ifdef CONFIG_NF_CONNTRACK_SECMARK
+ NLA_TYPE_SIZE(u_int32_t) /* CTA_SECMARK */
#endif
#ifdef CONFIG_NF_NAT_NEEDED
+ 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
+ 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_POS */
+ 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_BEFORE */
+ 2 * NLA_TYPE_SIZE(u_int32_t) /* CTA_NAT_SEQ_CORRECTION_AFTER */
#endif
#ifdef CONFIG_NF_CONNTRACK_MARK
+ NLA_TYPE_SIZE(u_int32_t) /* CTA_MARK */
#endif
;
#undef NLA_TYPE_SIZE
size_t len = 0;
rcu_read_lock();
l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
len += l3proto->nla_size;
l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
len += l4proto->nla_size;
rcu_read_unlock();
return nlmsg_new(len, gfp);
return len;
}
static inline size_t
ctnetlink_nlmsg_size(const struct nf_conn *ct)
{
return NLMSG_ALIGN(sizeof(struct nfgenmsg))
+ 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
+ 3 * nla_total_size(0) /* CTA_TUPLE_IP */
+ 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
+ 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
+ nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
+ nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
#ifdef CONFIG_NF_CT_ACCT
+ 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
+ 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
+ 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
#endif
+ nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
+ nla_total_size(0) /* CTA_PROTOINFO */
+ nla_total_size(0) /* CTA_HELP */
+ nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
#ifdef CONFIG_NF_CONNTRACK_SECMARK
+ nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
#endif
#ifdef CONFIG_NF_NAT_NEEDED
+ 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
+ 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
#endif
#ifdef CONFIG_NF_CONNTRACK_MARK
+ nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
#endif
+ ctnetlink_proto_size(ct)
;
}
static int ctnetlink_conntrack_event(struct notifier_block *this,
@ -507,9 +486,8 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
if (!item->report && !nfnetlink_has_listeners(group))
return NOTIFY_DONE;
skb = ctnetlink_alloc_skb(nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL),
GFP_ATOMIC);
if (!skb)
skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
if (skb == NULL)
goto errout;
type |= NFNL_SUBSYS_CTNETLINK << 8;