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[NETFILTER]: ctnetlink: fix NAT configuration 

The current configuration only allows to configure one manip and overloads
conntrack status flags with netlink semantic.

Signed-off-by: Patrick Mchardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-05-29 18:24:39 -07:00 committed by David S. Miller
parent 997ae831ad
commit 3726add766
3 changed files with 47 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/netfilter/nfnetlink_conntrack.h
View File

@ -27,13 +27,15 @@ enum ctattr_type {
CTA_STATUS,
CTA_PROTOINFO,
CTA_HELP,
CTA_NAT,
CTA_NAT_SRC,
#define CTA_NAT CTA_NAT_SRC /* backwards compatibility */
CTA_TIMEOUT,
CTA_MARK,
CTA_COUNTERS_ORIG,
CTA_COUNTERS_REPLY,
CTA_USE,
CTA_ID,
CTA_NAT_DST,
__CTA_MAX
};
#define CTA_MAX (__CTA_MAX - 1)

53
net/ipv4/netfilter/ip_conntrack_netlink.c
View File

@ -629,7 +629,7 @@ static const size_t cta_min_nat[CTA_NAT_MAX] = {
};
static inline int
ctnetlink_parse_nat(struct nfattr *cda[],
ctnetlink_parse_nat(struct nfattr *nat,
const struct ip_conntrack *ct, struct ip_nat_range *range)
{
struct nfattr *tb[CTA_NAT_MAX];
@ -639,7 +639,7 @@ ctnetlink_parse_nat(struct nfattr *cda[],
memset(range, 0, sizeof(*range));
nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]);
nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
return -EINVAL;
@ -854,39 +854,30 @@ ctnetlink_change_status(struct ip_conntrack *ct, struct nfattr *cda[])
/* ASSURED bit can only be set */
return -EINVAL;
if (cda[CTA_NAT-1]) {
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
#ifndef CONFIG_IP_NF_NAT_NEEDED
return -EINVAL;
#else
unsigned int hooknum;
struct ip_nat_range range;
if (ctnetlink_parse_nat(cda, ct, &range) < 0)
return -EINVAL;
DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
htons(range.min.all), htons(range.max.all));
/* This is tricky but it works. ip_nat_setup_info needs the
* hook number as parameter, so let's do the correct
* conversion and run away */
if (status & IPS_SRC_NAT_DONE)
hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
else if (status & IPS_DST_NAT_DONE)
hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */
else
return -EINVAL; /* Missing NAT flags */
DEBUGP("NAT status: %lu\n",
status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
if (ip_nat_initialized(ct, HOOK2MANIP(hooknum)))
return -EEXIST;
ip_nat_setup_info(ct, &range, hooknum);
DEBUGP("NAT status after setup_info: %lu\n",
ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
if (cda[CTA_NAT_DST-1]) {
if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
&range) < 0)
return -EINVAL;
if (ip_nat_initialized(ct,
HOOK2MANIP(NF_IP_PRE_ROUTING)))
return -EEXIST;
ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
}
if (cda[CTA_NAT_SRC-1]) {
if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
&range) < 0)
return -EINVAL;
if (ip_nat_initialized(ct,
HOOK2MANIP(NF_IP_POST_ROUTING)))
return -EEXIST;
ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
}
#endif
}
@ -1106,7 +1097,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
/* implicit 'else' */
/* we only allow nat config for new conntracks */
if (cda[CTA_NAT-1]) {
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
err = -EINVAL;
goto out_unlock;
}

53
net/netfilter/nf_conntrack_netlink.c
View File

@ -641,7 +641,7 @@ static const size_t cta_min_nat[CTA_NAT_MAX] = {
};
static inline int
ctnetlink_parse_nat(struct nfattr *cda[],
ctnetlink_parse_nat(struct nfattr *nat,
const struct nf_conn *ct, struct ip_nat_range *range)
{
struct nfattr *tb[CTA_NAT_MAX];
@ -651,7 +651,7 @@ ctnetlink_parse_nat(struct nfattr *cda[],
memset(range, 0, sizeof(*range));
nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]);
nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
return -EINVAL;
@ -866,39 +866,30 @@ ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
/* ASSURED bit can only be set */
return -EINVAL;
if (cda[CTA_NAT-1]) {
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
#ifndef CONFIG_IP_NF_NAT_NEEDED
return -EINVAL;
#else
unsigned int hooknum;
struct ip_nat_range range;
if (ctnetlink_parse_nat(cda, ct, &range) < 0)
return -EINVAL;
DEBUGP("NAT: %u.%u.%u.%u-%u.%u.%u.%u:%u-%u\n",
NIPQUAD(range.min_ip), NIPQUAD(range.max_ip),
htons(range.min.all), htons(range.max.all));
/* This is tricky but it works. ip_nat_setup_info needs the
* hook number as parameter, so let's do the correct
* conversion and run away */
if (status & IPS_SRC_NAT_DONE)
hooknum = NF_IP_POST_ROUTING; /* IP_NAT_MANIP_SRC */
else if (status & IPS_DST_NAT_DONE)
hooknum = NF_IP_PRE_ROUTING; /* IP_NAT_MANIP_DST */
else
return -EINVAL; /* Missing NAT flags */
DEBUGP("NAT status: %lu\n",
status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
if (ip_nat_initialized(ct, HOOK2MANIP(hooknum)))
return -EEXIST;
ip_nat_setup_info(ct, &range, hooknum);
DEBUGP("NAT status after setup_info: %lu\n",
ct->status & (IPS_NAT_MASK | IPS_NAT_DONE_MASK));
if (cda[CTA_NAT_DST-1]) {
if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
&range) < 0)
return -EINVAL;
if (ip_nat_initialized(ct,
HOOK2MANIP(NF_IP_PRE_ROUTING)))
return -EEXIST;
ip_nat_setup_info(ct, &range, hooknum);
}
if (cda[CTA_NAT_SRC-1]) {
if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
&range) < 0)
return -EINVAL;
if (ip_nat_initialized(ct,
HOOK2MANIP(NF_IP_POST_ROUTING)))
return -EEXIST;
ip_nat_setup_info(ct, &range, hooknum);
}
#endif
}
@ -1122,7 +1113,7 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
/* implicit 'else' */
/* we only allow nat config for new conntracks */
if (cda[CTA_NAT-1]) {
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
err = -EINVAL;
goto out_unlock;
}