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netfilter: ctnetlink: add CTA_HELP_INFO attribute 

This attribute can be used to modify and to dump the internal
protocol information.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-06-07 14:19:42 +02:00
parent 8c88f87cb2
commit ae243bee39
3 changed files with 20 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/netfilter/nfnetlink_conntrack.h
View File

@ -191,6 +191,7 @@ enum ctattr_expect_nat {
enum ctattr_help {
CTA_HELP_UNSPEC,
CTA_HELP_NAME,
CTA_HELP_INFO,
__CTA_HELP_MAX
};
#define CTA_HELP_MAX (__CTA_HELP_MAX - 1)

1
include/net/netfilter/nf_conntrack_helper.h
View File

@ -39,6 +39,7 @@ struct nf_conntrack_helper {
void (*destroy)(struct nf_conn *ct);
int (*from_nlattr)(struct nlattr *attr, struct nf_conn *ct);
int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
unsigned int expect_class_max;
};

21
net/netfilter/nf_conntrack_netlink.c
View File

@ -902,7 +902,8 @@ static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
};
static inline int
ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
struct nlattr **helpinfo)
{
struct nlattr *tb[CTA_HELP_MAX+1];
@ -913,6 +914,9 @@ ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
*helper_name = nla_data(tb[CTA_HELP_NAME]);
if (tb[CTA_HELP_INFO])
*helpinfo = tb[CTA_HELP_INFO];
return 0;
}
@ -1173,13 +1177,14 @@ ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
struct nf_conntrack_helper *helper;
struct nf_conn_help *help = nfct_help(ct);
char *helpname = NULL;
struct nlattr *helpinfo = NULL;
int err;
/* don't change helper of sibling connections */
if (ct->master)
return -EBUSY;
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
if (err < 0)
return err;
@ -1214,8 +1219,12 @@ ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
}
if (help) {
if (help->helper == helper)
if (help->helper == helper) {
/* update private helper data if allowed. */
if (helper->from_nlattr && helpinfo)
helper->from_nlattr(helpinfo, ct);
return 0;
}
if (help->helper)
return -EBUSY;
/* need to zero data of old helper */
@ -1411,8 +1420,9 @@ ctnetlink_create_conntrack(struct net *net, u16 zone,
rcu_read_lock();
if (cda[CTA_HELP]) {
char *helpname = NULL;
struct nlattr *helpinfo = NULL;
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
if (err < 0)
goto err2;
@ -1446,6 +1456,9 @@ ctnetlink_create_conntrack(struct net *net, u16 zone,
err = -ENOMEM;
goto err2;
}
/* set private helper data if allowed. */
if (helper->from_nlattr && helpinfo)
helper->from_nlattr(helpinfo, ct);
/* not in hash table yet so not strictly necessary */
RCU_INIT_POINTER(help->helper, helper);