netfilter: nat: move specific NAT IPv4 to core
Move the specific NAT IPv4 core functions that are called from the hooks from iptable_nat.c to nf_nat_l3proto_ipv4.c. This prepares the ground to allow iptables and nft to use the same NAT engine code that comes in a follow up patch. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso
parent
f111f780ae
commit
30766f4c2d
|
|
@ -42,6 +42,44 @@ const struct nf_nat_l3proto *__nf_nat_l3proto_find(u8 l3proto);
|
|||
int nf_nat_icmp_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
|
||||
enum ip_conntrack_info ctinfo,
|
||||
unsigned int hooknum);
|
||||
|
||||
unsigned int nf_nat_ipv4_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct));
|
||||
|
||||
unsigned int nf_nat_ipv4_out(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct));
|
||||
|
||||
unsigned int nf_nat_ipv4_local_fn(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct));
|
||||
|
||||
unsigned int nf_nat_ipv4_fn(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct));
|
||||
|
||||
int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
|
||||
enum ip_conntrack_info ctinfo,
|
||||
unsigned int hooknum, unsigned int hdrlen);
|
||||
|
|
|
|||
|
|
@ -28,222 +28,57 @@ static const struct xt_table nf_nat_ipv4_table = {
|
|||
.af = NFPROTO_IPV4,
|
||||
};
|
||||
|
||||
static unsigned int alloc_null_binding(struct nf_conn *ct, unsigned int hooknum)
|
||||
{
|
||||
/* Force range to this IP; let proto decide mapping for
|
||||
* per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED).
|
||||
*/
|
||||
struct nf_nat_range range;
|
||||
|
||||
range.flags = 0;
|
||||
pr_debug("Allocating NULL binding for %p (%pI4)\n", ct,
|
||||
HOOK2MANIP(hooknum) == NF_NAT_MANIP_SRC ?
|
||||
&ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip :
|
||||
&ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip);
|
||||
|
||||
return nf_nat_setup_info(ct, &range, HOOK2MANIP(hooknum));
|
||||
}
|
||||
|
||||
static unsigned int nf_nat_rule_find(struct sk_buff *skb, unsigned int hooknum,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct)
|
||||
static unsigned int iptable_nat_do_chain(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct)
|
||||
{
|
||||
struct net *net = nf_ct_net(ct);
|
||||
unsigned int ret;
|
||||
|
||||
ret = ipt_do_table(skb, hooknum, in, out, net->ipv4.nat_table);
|
||||
if (ret == NF_ACCEPT) {
|
||||
if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum)))
|
||||
ret = alloc_null_binding(ct, hooknum);
|
||||
}
|
||||
return ret;
|
||||
return ipt_do_table(skb, ops->hooknum, in, out, net->ipv4.nat_table);
|
||||
}
|
||||
|
||||
static unsigned int
|
||||
nf_nat_ipv4_fn(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
static unsigned int iptable_nat_ipv4_fn(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
{
|
||||
struct nf_conn *ct;
|
||||
enum ip_conntrack_info ctinfo;
|
||||
struct nf_conn_nat *nat;
|
||||
/* maniptype == SRC for postrouting. */
|
||||
enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
|
||||
|
||||
/* We never see fragments: conntrack defrags on pre-routing
|
||||
* and local-out, and nf_nat_out protects post-routing.
|
||||
*/
|
||||
NF_CT_ASSERT(!ip_is_fragment(ip_hdr(skb)));
|
||||
|
||||
ct = nf_ct_get(skb, &ctinfo);
|
||||
/* Can't track? It's not due to stress, or conntrack would
|
||||
* have dropped it. Hence it's the user's responsibilty to
|
||||
* packet filter it out, or implement conntrack/NAT for that
|
||||
* protocol. 8) --RR
|
||||
*/
|
||||
if (!ct)
|
||||
return NF_ACCEPT;
|
||||
|
||||
/* Don't try to NAT if this packet is not conntracked */
|
||||
if (nf_ct_is_untracked(ct))
|
||||
return NF_ACCEPT;
|
||||
|
||||
nat = nf_ct_nat_ext_add(ct);
|
||||
if (nat == NULL)
|
||||
return NF_ACCEPT;
|
||||
|
||||
switch (ctinfo) {
|
||||
case IP_CT_RELATED:
|
||||
case IP_CT_RELATED_REPLY:
|
||||
if (ip_hdr(skb)->protocol == IPPROTO_ICMP) {
|
||||
if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
|
||||
ops->hooknum))
|
||||
return NF_DROP;
|
||||
else
|
||||
return NF_ACCEPT;
|
||||
}
|
||||
/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
|
||||
case IP_CT_NEW:
|
||||
/* Seen it before? This can happen for loopback, retrans,
|
||||
* or local packets.
|
||||
*/
|
||||
if (!nf_nat_initialized(ct, maniptype)) {
|
||||
unsigned int ret;
|
||||
|
||||
ret = nf_nat_rule_find(skb, ops->hooknum, in, out, ct);
|
||||
if (ret != NF_ACCEPT)
|
||||
return ret;
|
||||
} else {
|
||||
pr_debug("Already setup manip %s for ct %p\n",
|
||||
maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST",
|
||||
ct);
|
||||
if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
|
||||
goto oif_changed;
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
/* ESTABLISHED */
|
||||
NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED ||
|
||||
ctinfo == IP_CT_ESTABLISHED_REPLY);
|
||||
if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
|
||||
goto oif_changed;
|
||||
}
|
||||
|
||||
return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
|
||||
|
||||
oif_changed:
|
||||
nf_ct_kill_acct(ct, ctinfo, skb);
|
||||
return NF_DROP;
|
||||
return nf_nat_ipv4_fn(ops, skb, in, out, iptable_nat_do_chain);
|
||||
}
|
||||
|
||||
static unsigned int
|
||||
nf_nat_ipv4_in(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
static unsigned int iptable_nat_ipv4_in(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
{
|
||||
unsigned int ret;
|
||||
__be32 daddr = ip_hdr(skb)->daddr;
|
||||
|
||||
ret = nf_nat_ipv4_fn(ops, skb, in, out, okfn);
|
||||
if (ret != NF_DROP && ret != NF_STOLEN &&
|
||||
daddr != ip_hdr(skb)->daddr)
|
||||
skb_dst_drop(skb);
|
||||
|
||||
return ret;
|
||||
return nf_nat_ipv4_in(ops, skb, in, out, iptable_nat_do_chain);
|
||||
}
|
||||
|
||||
static unsigned int
|
||||
nf_nat_ipv4_out(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
static unsigned int iptable_nat_ipv4_out(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
{
|
||||
#ifdef CONFIG_XFRM
|
||||
const struct nf_conn *ct;
|
||||
enum ip_conntrack_info ctinfo;
|
||||
int err;
|
||||
#endif
|
||||
unsigned int ret;
|
||||
|
||||
/* root is playing with raw sockets. */
|
||||
if (skb->len < sizeof(struct iphdr) ||
|
||||
ip_hdrlen(skb) < sizeof(struct iphdr))
|
||||
return NF_ACCEPT;
|
||||
|
||||
ret = nf_nat_ipv4_fn(ops, skb, in, out, okfn);
|
||||
#ifdef CONFIG_XFRM
|
||||
if (ret != NF_DROP && ret != NF_STOLEN &&
|
||||
!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
|
||||
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
|
||||
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
||||
|
||||
if ((ct->tuplehash[dir].tuple.src.u3.ip !=
|
||||
ct->tuplehash[!dir].tuple.dst.u3.ip) ||
|
||||
(ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
|
||||
ct->tuplehash[dir].tuple.src.u.all !=
|
||||
ct->tuplehash[!dir].tuple.dst.u.all)) {
|
||||
err = nf_xfrm_me_harder(skb, AF_INET);
|
||||
if (err < 0)
|
||||
ret = NF_DROP_ERR(err);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
return ret;
|
||||
return nf_nat_ipv4_out(ops, skb, in, out, iptable_nat_do_chain);
|
||||
}
|
||||
|
||||
static unsigned int
|
||||
nf_nat_ipv4_local_fn(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
static unsigned int iptable_nat_ipv4_local_fn(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
int (*okfn)(struct sk_buff *))
|
||||
{
|
||||
const struct nf_conn *ct;
|
||||
enum ip_conntrack_info ctinfo;
|
||||
unsigned int ret;
|
||||
int err;
|
||||
|
||||
/* root is playing with raw sockets. */
|
||||
if (skb->len < sizeof(struct iphdr) ||
|
||||
ip_hdrlen(skb) < sizeof(struct iphdr))
|
||||
return NF_ACCEPT;
|
||||
|
||||
ret = nf_nat_ipv4_fn(ops, skb, in, out, okfn);
|
||||
if (ret != NF_DROP && ret != NF_STOLEN &&
|
||||
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
|
||||
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
||||
|
||||
if (ct->tuplehash[dir].tuple.dst.u3.ip !=
|
||||
ct->tuplehash[!dir].tuple.src.u3.ip) {
|
||||
err = ip_route_me_harder(skb, RTN_UNSPEC);
|
||||
if (err < 0)
|
||||
ret = NF_DROP_ERR(err);
|
||||
}
|
||||
#ifdef CONFIG_XFRM
|
||||
else if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
|
||||
ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
|
||||
ct->tuplehash[dir].tuple.dst.u.all !=
|
||||
ct->tuplehash[!dir].tuple.src.u.all) {
|
||||
err = nf_xfrm_me_harder(skb, AF_INET);
|
||||
if (err < 0)
|
||||
ret = NF_DROP_ERR(err);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
return ret;
|
||||
return nf_nat_ipv4_local_fn(ops, skb, in, out, iptable_nat_do_chain);
|
||||
}
|
||||
|
||||
static struct nf_hook_ops nf_nat_ipv4_ops[] __read_mostly = {
|
||||
/* Before packet filtering, change destination */
|
||||
{
|
||||
.hook = nf_nat_ipv4_in,
|
||||
.hook = iptable_nat_ipv4_in,
|
||||
.owner = THIS_MODULE,
|
||||
.pf = NFPROTO_IPV4,
|
||||
.hooknum = NF_INET_PRE_ROUTING,
|
||||
|
|
@ -251,7 +86,7 @@ static struct nf_hook_ops nf_nat_ipv4_ops[] __read_mostly = {
|
|||
},
|
||||
/* After packet filtering, change source */
|
||||
{
|
||||
.hook = nf_nat_ipv4_out,
|
||||
.hook = iptable_nat_ipv4_out,
|
||||
.owner = THIS_MODULE,
|
||||
.pf = NFPROTO_IPV4,
|
||||
.hooknum = NF_INET_POST_ROUTING,
|
||||
|
|
@ -259,7 +94,7 @@ static struct nf_hook_ops nf_nat_ipv4_ops[] __read_mostly = {
|
|||
},
|
||||
/* Before packet filtering, change destination */
|
||||
{
|
||||
.hook = nf_nat_ipv4_local_fn,
|
||||
.hook = iptable_nat_ipv4_local_fn,
|
||||
.owner = THIS_MODULE,
|
||||
.pf = NFPROTO_IPV4,
|
||||
.hooknum = NF_INET_LOCAL_OUT,
|
||||
|
|
@ -267,7 +102,7 @@ static struct nf_hook_ops nf_nat_ipv4_ops[] __read_mostly = {
|
|||
},
|
||||
/* After packet filtering, change source */
|
||||
{
|
||||
.hook = nf_nat_ipv4_fn,
|
||||
.hook = iptable_nat_ipv4_fn,
|
||||
.owner = THIS_MODULE,
|
||||
.pf = NFPROTO_IPV4,
|
||||
.hooknum = NF_INET_LOCAL_IN,
|
||||
|
|
|
|||
|
|
@ -254,6 +254,205 @@ int nf_nat_icmp_reply_translation(struct sk_buff *skb,
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
|
||||
|
||||
unsigned int
|
||||
nf_nat_ipv4_fn(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
||||
const struct net_device *in, const struct net_device *out,
|
||||
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct))
|
||||
{
|
||||
struct nf_conn *ct;
|
||||
enum ip_conntrack_info ctinfo;
|
||||
struct nf_conn_nat *nat;
|
||||
/* maniptype == SRC for postrouting. */
|
||||
enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
|
||||
|
||||
/* We never see fragments: conntrack defrags on pre-routing
|
||||
* and local-out, and nf_nat_out protects post-routing.
|
||||
*/
|
||||
NF_CT_ASSERT(!ip_is_fragment(ip_hdr(skb)));
|
||||
|
||||
ct = nf_ct_get(skb, &ctinfo);
|
||||
/* Can't track? It's not due to stress, or conntrack would
|
||||
* have dropped it. Hence it's the user's responsibilty to
|
||||
* packet filter it out, or implement conntrack/NAT for that
|
||||
* protocol. 8) --RR
|
||||
*/
|
||||
if (!ct)
|
||||
return NF_ACCEPT;
|
||||
|
||||
/* Don't try to NAT if this packet is not conntracked */
|
||||
if (nf_ct_is_untracked(ct))
|
||||
return NF_ACCEPT;
|
||||
|
||||
nat = nf_ct_nat_ext_add(ct);
|
||||
if (nat == NULL)
|
||||
return NF_ACCEPT;
|
||||
|
||||
switch (ctinfo) {
|
||||
case IP_CT_RELATED:
|
||||
case IP_CT_RELATED_REPLY:
|
||||
if (ip_hdr(skb)->protocol == IPPROTO_ICMP) {
|
||||
if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
|
||||
ops->hooknum))
|
||||
return NF_DROP;
|
||||
else
|
||||
return NF_ACCEPT;
|
||||
}
|
||||
/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
|
||||
case IP_CT_NEW:
|
||||
/* Seen it before? This can happen for loopback, retrans,
|
||||
* or local packets.
|
||||
*/
|
||||
if (!nf_nat_initialized(ct, maniptype)) {
|
||||
unsigned int ret;
|
||||
|
||||
ret = do_chain(ops, skb, in, out, ct);
|
||||
if (ret != NF_ACCEPT)
|
||||
return ret;
|
||||
|
||||
if (nf_nat_initialized(ct, HOOK2MANIP(ops->hooknum)))
|
||||
break;
|
||||
|
||||
ret = nf_nat_alloc_null_binding(ct, ops->hooknum);
|
||||
if (ret != NF_ACCEPT)
|
||||
return ret;
|
||||
} else {
|
||||
pr_debug("Already setup manip %s for ct %p\n",
|
||||
maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST",
|
||||
ct);
|
||||
if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
|
||||
goto oif_changed;
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
/* ESTABLISHED */
|
||||
NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED ||
|
||||
ctinfo == IP_CT_ESTABLISHED_REPLY);
|
||||
if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
|
||||
goto oif_changed;
|
||||
}
|
||||
|
||||
return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
|
||||
|
||||
oif_changed:
|
||||
nf_ct_kill_acct(ct, ctinfo, skb);
|
||||
return NF_DROP;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_nat_ipv4_fn);
|
||||
|
||||
unsigned int
|
||||
nf_nat_ipv4_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
||||
const struct net_device *in, const struct net_device *out,
|
||||
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct))
|
||||
{
|
||||
unsigned int ret;
|
||||
__be32 daddr = ip_hdr(skb)->daddr;
|
||||
|
||||
ret = nf_nat_ipv4_fn(ops, skb, in, out, do_chain);
|
||||
if (ret != NF_DROP && ret != NF_STOLEN &&
|
||||
daddr != ip_hdr(skb)->daddr)
|
||||
skb_dst_drop(skb);
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_nat_ipv4_in);
|
||||
|
||||
unsigned int
|
||||
nf_nat_ipv4_out(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
||||
const struct net_device *in, const struct net_device *out,
|
||||
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct))
|
||||
{
|
||||
#ifdef CONFIG_XFRM
|
||||
const struct nf_conn *ct;
|
||||
enum ip_conntrack_info ctinfo;
|
||||
int err;
|
||||
#endif
|
||||
unsigned int ret;
|
||||
|
||||
/* root is playing with raw sockets. */
|
||||
if (skb->len < sizeof(struct iphdr) ||
|
||||
ip_hdrlen(skb) < sizeof(struct iphdr))
|
||||
return NF_ACCEPT;
|
||||
|
||||
ret = nf_nat_ipv4_fn(ops, skb, in, out, do_chain);
|
||||
#ifdef CONFIG_XFRM
|
||||
if (ret != NF_DROP && ret != NF_STOLEN &&
|
||||
!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
|
||||
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
|
||||
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
||||
|
||||
if ((ct->tuplehash[dir].tuple.src.u3.ip !=
|
||||
ct->tuplehash[!dir].tuple.dst.u3.ip) ||
|
||||
(ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
|
||||
ct->tuplehash[dir].tuple.src.u.all !=
|
||||
ct->tuplehash[!dir].tuple.dst.u.all)) {
|
||||
err = nf_xfrm_me_harder(skb, AF_INET);
|
||||
if (err < 0)
|
||||
ret = NF_DROP_ERR(err);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_nat_ipv4_out);
|
||||
|
||||
unsigned int
|
||||
nf_nat_ipv4_local_fn(const struct nf_hook_ops *ops, struct sk_buff *skb,
|
||||
const struct net_device *in, const struct net_device *out,
|
||||
unsigned int (*do_chain)(const struct nf_hook_ops *ops,
|
||||
struct sk_buff *skb,
|
||||
const struct net_device *in,
|
||||
const struct net_device *out,
|
||||
struct nf_conn *ct))
|
||||
{
|
||||
const struct nf_conn *ct;
|
||||
enum ip_conntrack_info ctinfo;
|
||||
unsigned int ret;
|
||||
int err;
|
||||
|
||||
/* root is playing with raw sockets. */
|
||||
if (skb->len < sizeof(struct iphdr) ||
|
||||
ip_hdrlen(skb) < sizeof(struct iphdr))
|
||||
return NF_ACCEPT;
|
||||
|
||||
ret = nf_nat_ipv4_fn(ops, skb, in, out, do_chain);
|
||||
if (ret != NF_DROP && ret != NF_STOLEN &&
|
||||
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
|
||||
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
||||
|
||||
if (ct->tuplehash[dir].tuple.dst.u3.ip !=
|
||||
ct->tuplehash[!dir].tuple.src.u3.ip) {
|
||||
err = ip_route_me_harder(skb, RTN_UNSPEC);
|
||||
if (err < 0)
|
||||
ret = NF_DROP_ERR(err);
|
||||
}
|
||||
#ifdef CONFIG_XFRM
|
||||
else if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
|
||||
ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
|
||||
ct->tuplehash[dir].tuple.dst.u.all !=
|
||||
ct->tuplehash[!dir].tuple.src.u.all) {
|
||||
err = nf_xfrm_me_harder(skb, AF_INET);
|
||||
if (err < 0)
|
||||
ret = NF_DROP_ERR(err);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nf_nat_ipv4_local_fn);
|
||||
|
||||
static int __init nf_nat_l3proto_ipv4_init(void)
|
||||
{
|
||||
int err;
|
||||
|
|
|
|||
Loading…
Reference in New Issue