#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_helper.h>
#include <linux/netfilter_ipv4/ip_tables.h>
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
#ifdef CONFIG_XFRM
static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
{
- struct nf_conn *ct;
- struct nf_conntrack_tuple *t;
+ const struct nf_conn *ct;
+ const struct nf_conntrack_tuple *t;
enum ip_conntrack_info ctinfo;
enum ip_conntrack_dir dir;
unsigned long statusbit;
if (ct->status & statusbit) {
fl->fl4_dst = t->dst.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
- t->dst.protonum == IPPROTO_UDP)
+ t->dst.protonum == IPPROTO_UDP ||
+ t->dst.protonum == IPPROTO_UDPLITE ||
+ t->dst.protonum == IPPROTO_DCCP ||
+ t->dst.protonum == IPPROTO_SCTP)
fl->fl_ip_dport = t->dst.u.tcp.port;
}
if (ct->status & statusbit) {
fl->fl4_src = t->src.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
- t->dst.protonum == IPPROTO_UDP)
+ t->dst.protonum == IPPROTO_UDP ||
+ t->dst.protonum == IPPROTO_UDPLITE ||
+ t->dst.protonum == IPPROTO_DCCP ||
+ t->dst.protonum == IPPROTO_SCTP)
fl->fl_ip_sport = t->src.u.tcp.port;
}
}
static unsigned int
nf_nat_fn(unsigned int hooknum,
- struct sk_buff **pskb,
+ 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;
- struct nf_nat_info *info;
/* maniptype == SRC for postrouting. */
enum nf_nat_manip_type maniptype = HOOK2MANIP(hooknum);
/* We never see fragments: conntrack defrags on pre-routing
and local-out, and nf_nat_out protects post-routing. */
- NF_CT_ASSERT(!((*pskb)->nh.iph->frag_off
- & htons(IP_MF|IP_OFFSET)));
+ NF_CT_ASSERT(!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)));
- ct = nf_ct_get(*pskb, &ctinfo);
+ 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) {
- /* Exception: ICMP redirect to new connection (not in
- hash table yet). We must not let this through, in
- case we're doing NAT to the same network. */
- if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
- struct icmphdr _hdr, *hp;
-
- hp = skb_header_pointer(*pskb,
- (*pskb)->nh.iph->ihl*4,
- sizeof(_hdr), &_hdr);
- if (hp != NULL &&
- hp->type == ICMP_REDIRECT)
- return NF_DROP;
- }
+ if (!ct)
return NF_ACCEPT;
- }
/* Don't try to NAT if this packet is not conntracked */
if (ct == &nf_conntrack_untracked)
return NF_ACCEPT;
nat = nfct_nat(ct);
- if (!nat)
- return NF_ACCEPT;
+ if (!nat) {
+ /* NAT module was loaded late. */
+ if (nf_ct_is_confirmed(ct))
+ return NF_ACCEPT;
+ nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC);
+ if (nat == NULL) {
+ pr_debug("failed to add NAT extension\n");
+ return NF_ACCEPT;
+ }
+ }
switch (ctinfo) {
case IP_CT_RELATED:
case IP_CT_RELATED+IP_CT_IS_REPLY:
- if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+ if (ip_hdr(skb)->protocol == IPPROTO_ICMP) {
if (!nf_nat_icmp_reply_translation(ct, ctinfo,
- hooknum, pskb))
+ hooknum, skb))
return NF_DROP;
else
return NF_ACCEPT;
}
/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
case IP_CT_NEW:
- info = &nat->info;
/* Seen it before? This can happen for loopback, retrans,
or local packets.. */
if (!nf_nat_initialized(ct, maniptype)) {
unsigned int ret;
- if (unlikely(nf_ct_is_confirmed(ct)))
- /* NAT module was loaded late */
- ret = alloc_null_binding_confirmed(ct, info,
- hooknum);
- else if (hooknum == NF_IP_LOCAL_IN)
+ if (hooknum == NF_INET_LOCAL_IN)
/* LOCAL_IN hook doesn't have a chain! */
- ret = alloc_null_binding(ct, info, hooknum);
+ ret = alloc_null_binding(ct, hooknum);
else
- ret = nf_nat_rule_find(pskb, hooknum, in, out,
- ct, info);
+ ret = nf_nat_rule_find(skb, hooknum, in, out,
+ ct);
if (ret != NF_ACCEPT) {
return ret;
}
} else
- DEBUGP("Already setup manip %s for ct %p\n",
- maniptype == IP_NAT_MANIP_SRC ? "SRC" : "DST",
- ct);
+ pr_debug("Already setup manip %s for ct %p\n",
+ maniptype == IP_NAT_MANIP_SRC ? "SRC" : "DST",
+ ct);
break;
default:
/* ESTABLISHED */
NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED ||
ctinfo == (IP_CT_ESTABLISHED+IP_CT_IS_REPLY));
- info = &nat->info;
}
- NF_CT_ASSERT(info);
- return nf_nat_packet(ct, ctinfo, hooknum, pskb);
+ return nf_nat_packet(ct, ctinfo, hooknum, skb);
}
static unsigned int
nf_nat_in(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
{
unsigned int ret;
- __be32 daddr = (*pskb)->nh.iph->daddr;
+ __be32 daddr = ip_hdr(skb)->daddr;
- ret = nf_nat_fn(hooknum, pskb, in, out, okfn);
+ ret = nf_nat_fn(hooknum, skb, in, out, okfn);
if (ret != NF_DROP && ret != NF_STOLEN &&
- daddr != (*pskb)->nh.iph->daddr) {
- dst_release((*pskb)->dst);
- (*pskb)->dst = NULL;
- }
+ daddr != ip_hdr(skb)->daddr)
+ skb_dst_drop(skb);
+
return ret;
}
static unsigned int
nf_nat_out(unsigned int hooknum,
- struct sk_buff **pskb,
+ struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
#ifdef CONFIG_XFRM
- struct nf_conn *ct;
+ const struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
#endif
unsigned int ret;
/* root is playing with raw sockets. */
- if ((*pskb)->len < sizeof(struct iphdr) ||
- (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+ if (skb->len < sizeof(struct iphdr) ||
+ ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
- ret = nf_nat_fn(hooknum, pskb, in, out, okfn);
+ ret = nf_nat_fn(hooknum, skb, in, out, okfn);
#ifdef CONFIG_XFRM
if (ret != NF_DROP && ret != NF_STOLEN &&
- (ct = nf_ct_get(*pskb, &ctinfo)) != NULL) {
+ (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.src.u.all !=
ct->tuplehash[!dir].tuple.dst.u.all
)
- return ip_xfrm_me_harder(pskb) == 0 ? ret : NF_DROP;
+ return ip_xfrm_me_harder(skb) == 0 ? ret : NF_DROP;
}
#endif
return ret;
static unsigned int
nf_nat_local_fn(unsigned int hooknum,
- struct sk_buff **pskb,
+ struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
- struct nf_conn *ct;
+ const struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
unsigned int ret;
/* root is playing with raw sockets. */
- if ((*pskb)->len < sizeof(struct iphdr) ||
- (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+ if (skb->len < sizeof(struct iphdr) ||
+ ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
- ret = nf_nat_fn(hooknum, pskb, in, out, okfn);
+ ret = nf_nat_fn(hooknum, skb, in, out, okfn);
if (ret != NF_DROP && ret != NF_STOLEN &&
- (ct = nf_ct_get(*pskb, &ctinfo)) != NULL) {
+ (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
+ ct->tuplehash[!dir].tuple.src.u3.ip) {
+ if (ip_route_me_harder(skb, RTN_UNSPEC))
+ ret = NF_DROP;
+ }
#ifdef CONFIG_XFRM
- || ct->tuplehash[dir].tuple.dst.u.all !=
- ct->tuplehash[!dir].tuple.src.u.all
-#endif
- )
- if (ip_route_me_harder(pskb, RTN_UNSPEC))
+ else if (ct->tuplehash[dir].tuple.dst.u.all !=
+ ct->tuplehash[!dir].tuple.src.u.all)
+ if (ip_xfrm_me_harder(skb))
ret = NF_DROP;
+#endif
}
return ret;
}
-static unsigned int
-nf_nat_adjust(unsigned int hooknum,
- struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
-{
- struct nf_conn *ct;
- enum ip_conntrack_info ctinfo;
-
- ct = nf_ct_get(*pskb, &ctinfo);
- if (ct && test_bit(IPS_SEQ_ADJUST_BIT, &ct->status)) {
- DEBUGP("nf_nat_standalone: adjusting sequence number\n");
- if (!nf_nat_seq_adjust(pskb, ct, ctinfo))
- return NF_DROP;
- }
- return NF_ACCEPT;
-}
-
/* We must be after connection tracking and before packet filtering. */
-static struct nf_hook_ops nf_nat_ops[] = {
+static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
/* Before packet filtering, change destination */
{
.hook = nf_nat_in,
.owner = THIS_MODULE,
.pf = PF_INET,
- .hooknum = NF_IP_PRE_ROUTING,
+ .hooknum = NF_INET_PRE_ROUTING,
.priority = NF_IP_PRI_NAT_DST,
},
/* After packet filtering, change source */
.hook = nf_nat_out,
.owner = THIS_MODULE,
.pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
+ .hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP_PRI_NAT_SRC,
},
- /* After conntrack, adjust sequence number */
- {
- .hook = nf_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_POST_ROUTING,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
- },
/* Before packet filtering, change destination */
{
.hook = nf_nat_local_fn,
.owner = THIS_MODULE,
.pf = PF_INET,
- .hooknum = NF_IP_LOCAL_OUT,
+ .hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_NAT_DST,
},
/* After packet filtering, change source */
.hook = nf_nat_fn,
.owner = THIS_MODULE,
.pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
+ .hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_NAT_SRC,
},
- /* After conntrack, adjust sequence number */
- {
- .hook = nf_nat_adjust,
- .owner = THIS_MODULE,
- .pf = PF_INET,
- .hooknum = NF_IP_LOCAL_IN,
- .priority = NF_IP_PRI_NAT_SEQ_ADJUST,
- },
};
static int __init nf_nat_standalone_init(void)
{
- int size, ret = 0;
+ int ret = 0;
- need_conntrack();
+ need_ipv4_conntrack();
- size = ALIGN(sizeof(struct nf_conn), __alignof__(struct nf_conn_nat)) +
- sizeof(struct nf_conn_nat);
- ret = nf_conntrack_register_cache(NF_CT_F_NAT, "nf_nat:base", size);
- if (ret < 0) {
- printk(KERN_ERR "nf_nat_init: Unable to create slab cache\n");
- return ret;
- }
-
- size = ALIGN(size, __alignof__(struct nf_conn_help)) +
- sizeof(struct nf_conn_help);
- ret = nf_conntrack_register_cache(NF_CT_F_NAT|NF_CT_F_HELP,
- "nf_nat:help", size);
- if (ret < 0) {
- printk(KERN_ERR "nf_nat_init: Unable to create slab cache\n");
- goto cleanup_register_cache;
- }
#ifdef CONFIG_XFRM
BUG_ON(ip_nat_decode_session != NULL);
- ip_nat_decode_session = nat_decode_session;
+ rcu_assign_pointer(ip_nat_decode_session, nat_decode_session);
#endif
ret = nf_nat_rule_init();
if (ret < 0) {
printk("nf_nat_init: can't register hooks.\n");
goto cleanup_rule_init;
}
- nf_nat_module_is_loaded = 1;
return ret;
cleanup_rule_init:
nf_nat_rule_cleanup();
cleanup_decode_session:
#ifdef CONFIG_XFRM
- ip_nat_decode_session = NULL;
+ rcu_assign_pointer(ip_nat_decode_session, NULL);
synchronize_net();
#endif
- nf_conntrack_unregister_cache(NF_CT_F_NAT|NF_CT_F_HELP);
- cleanup_register_cache:
- nf_conntrack_unregister_cache(NF_CT_F_NAT);
return ret;
}
{
nf_unregister_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops));
nf_nat_rule_cleanup();
- nf_nat_module_is_loaded = 0;
#ifdef CONFIG_XFRM
- ip_nat_decode_session = NULL;
+ rcu_assign_pointer(ip_nat_decode_session, NULL);
synchronize_net();
#endif
/* Conntrack caches are unregistered in nf_conntrack_cleanup */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff