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netfilter: ctnetlink: allow to set expectation class 

This patch allows you to set the expectation class.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-02-05 03:21:12 +01:00
parent 660fdb2a0f
commit b8c5e52c13
2 changed files with 12 additions and 1 deletions
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1
include/linux/netfilter/nfnetlink_conntrack.h
View File

@ -173,6 +173,7 @@ enum ctattr_expect {
CTA_EXPECT_HELP_NAME,
CTA_EXPECT_ZONE,
CTA_EXPECT_FLAGS,
CTA_EXPECT_CLASS,
__CTA_EXPECT_MAX
};
#define CTA_EXPECT_MAX (__CTA_EXPECT_MAX - 1)

12
net/netfilter/nf_conntrack_netlink.c
View File

@ -1691,6 +1691,7 @@ ctnetlink_exp_dump_expect(struct sk_buff *skb,
NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
NLA_PUT_BE32(skb, CTA_EXPECT_CLASS, htonl(exp->class));
help = nfct_help(master);
if (help) {
struct nf_conntrack_helper *helper;
@ -1856,6 +1857,7 @@ static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
[CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING },
[CTA_EXPECT_ZONE] = { .type = NLA_U16 },
[CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
[CTA_EXPECT_CLASS] = { .type = NLA_U32 },
};
static int
@ -2043,6 +2045,7 @@ ctnetlink_create_expect(struct net *net, u16 zone,
struct nf_conn *ct;
struct nf_conn_help *help;
struct nf_conntrack_helper *helper = NULL;
u_int32_t class = 0;
int err = 0;
/* caller guarantees that those three CTA_EXPECT_* exist */
@ -2088,6 +2091,13 @@ ctnetlink_create_expect(struct net *net, u16 zone,
}
}
if (cda[CTA_EXPECT_CLASS] && helper) {
class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
if (class > helper->expect_class_max) {
err = -EINVAL;
goto out;
}
}
exp = nf_ct_expect_alloc(ct);
if (!exp) {
err = -ENOMEM;
@ -2115,7 +2125,7 @@ ctnetlink_create_expect(struct net *net, u16 zone,
exp->flags = 0;
}
exp->class = 0;
exp->class = class;
exp->expectfn = NULL;
exp->master = ct;
exp->helper = helper;