#include <linux/types.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
-#include <linux/vmalloc.h>
#include <net/checksum.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
-#if 0
-#define DEBUGP printk
-#else
-#define DEBUGP(format, args...)
-#endif
-
static DEFINE_RWLOCK(nf_nat_lock);
static struct nf_conntrack_l3proto *l3proto = NULL;
/* Calculated at init based on memory size */
static unsigned int nf_nat_htable_size;
+static int nf_nat_vmalloced;
-static struct list_head *bysource;
+static struct hlist_head *bysource;
#define MAX_IP_NAT_PROTO 256
static struct nf_nat_protocol *nf_nat_protos[MAX_IP_NAT_PROTO];
static inline struct nf_nat_protocol *
__nf_nat_proto_find(u_int8_t protonum)
{
- return nf_nat_protos[protonum];
+ return rcu_dereference(nf_nat_protos[protonum]);
}
struct nf_nat_protocol *
{
struct nf_nat_protocol *p;
- /* we need to disable preemption to make sure 'p' doesn't get
- * removed until we've grabbed the reference */
- preempt_disable();
+ rcu_read_lock();
p = __nf_nat_proto_find(protonum);
if (!try_module_get(p->me))
p = &nf_nat_unknown_protocol;
- preempt_enable();
+ rcu_read_unlock();
return p;
}
hash_by_src(const struct nf_conntrack_tuple *tuple)
{
/* Original src, to ensure we map it consistently if poss. */
- return jhash_3words((__force u32)tuple->src.u3.ip, tuple->src.u.all,
+ return jhash_3words((__force u32)tuple->src.u3.ip,
+ (__force u32)tuple->src.u.all,
tuple->dst.protonum, 0) % nf_nat_htable_size;
}
-/* Noone using conntrack by the time this called. */
-static void nf_nat_cleanup_conntrack(struct nf_conn *conn)
-{
- struct nf_conn_nat *nat;
- if (!(conn->status & IPS_NAT_DONE_MASK))
- return;
-
- nat = nfct_nat(conn);
- write_lock_bh(&nf_nat_lock);
- list_del(&nat->info.bysource);
- write_unlock_bh(&nf_nat_lock);
-}
-
/* Is this tuple already taken? (not by us) */
int
nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
const struct nf_nat_range *range)
{
struct nf_nat_protocol *proto;
+ int ret = 0;
- proto = __nf_nat_proto_find(tuple->dst.protonum);
/* If we are supposed to map IPs, then we must be in the
range specified, otherwise let this drag us onto a new src IP. */
if (range->flags & IP_NAT_RANGE_MAP_IPS) {
return 0;
}
+ rcu_read_lock();
+ proto = __nf_nat_proto_find(tuple->dst.protonum);
if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED) ||
proto->in_range(tuple, IP_NAT_MANIP_SRC,
&range->min, &range->max))
- return 1;
+ ret = 1;
+ rcu_read_unlock();
- return 0;
+ return ret;
}
static inline int
unsigned int h = hash_by_src(tuple);
struct nf_conn_nat *nat;
struct nf_conn *ct;
+ struct hlist_node *n;
read_lock_bh(&nf_nat_lock);
- list_for_each_entry(nat, &bysource[h], info.bysource) {
- ct = (struct nf_conn *)((char *)nat - offsetof(struct nf_conn, data));
+ hlist_for_each_entry(nat, n, &bysource[h], bysource) {
+ ct = nat->ct;
if (same_src(ct, tuple)) {
/* Copy source part from reply tuple. */
nf_ct_invert_tuplepr(result,
*var_ipp = htonl(minip + j % (maxip - minip + 1));
}
-/* Manipulate the tuple into the range given. For NF_IP_POST_ROUTING,
- * we change the source to map into the range. For NF_IP_PRE_ROUTING
- * and NF_IP_LOCAL_OUT, we change the destination to map into the
+/* Manipulate the tuple into the range given. For NF_INET_POST_ROUTING,
+ * we change the source to map into the range. For NF_INET_PRE_ROUTING
+ * and NF_INET_LOCAL_OUT, we change the destination to map into the
* range. It might not be possible to get a unique tuple, but we try.
* At worst (or if we race), we will end up with a final duplicate in
* __ip_conntrack_confirm and drop the packet. */
manips not an issue. */
if (maniptype == IP_NAT_MANIP_SRC) {
if (find_appropriate_src(orig_tuple, tuple, range)) {
- DEBUGP("get_unique_tuple: Found current src map\n");
- if (!nf_nat_used_tuple(tuple, ct))
- return;
+ pr_debug("get_unique_tuple: Found current src map\n");
+ if (!(range->flags & IP_NAT_RANGE_PROTO_RANDOM))
+ if (!nf_nat_used_tuple(tuple, ct))
+ return;
}
}
/* 3) The per-protocol part of the manip is made to map into
the range to make a unique tuple. */
- proto = nf_nat_proto_find_get(orig_tuple->dst.protonum);
+ rcu_read_lock();
+ proto = __nf_nat_proto_find(orig_tuple->dst.protonum);
+
+ /* Change protocol info to have some randomization */
+ if (range->flags & IP_NAT_RANGE_PROTO_RANDOM) {
+ proto->unique_tuple(tuple, range, maniptype, ct);
+ goto out;
+ }
/* Only bother mapping if it's not already in range and unique */
if ((!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED) ||
proto->in_range(tuple, maniptype, &range->min, &range->max)) &&
- !nf_nat_used_tuple(tuple, ct)) {
- nf_nat_proto_put(proto);
- return;
- }
+ !nf_nat_used_tuple(tuple, ct))
+ goto out;
/* Last change: get protocol to try to obtain unique tuple. */
proto->unique_tuple(tuple, range, maniptype, ct);
-
- nf_nat_proto_put(proto);
+out:
+ rcu_read_unlock();
}
unsigned int
unsigned int hooknum)
{
struct nf_conntrack_tuple curr_tuple, new_tuple;
- struct nf_conn_nat *nat = nfct_nat(ct);
- struct nf_nat_info *info = &nat->info;
+ struct nf_conn_nat *nat;
int have_to_hash = !(ct->status & IPS_NAT_DONE_MASK);
enum nf_nat_manip_type maniptype = HOOK2MANIP(hooknum);
- NF_CT_ASSERT(hooknum == NF_IP_PRE_ROUTING ||
- hooknum == NF_IP_POST_ROUTING ||
- hooknum == NF_IP_LOCAL_IN ||
- hooknum == NF_IP_LOCAL_OUT);
+ /* nat helper or nfctnetlink also setup binding */
+ nat = nfct_nat(ct);
+ if (!nat) {
+ 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;
+ }
+ }
+
+ NF_CT_ASSERT(hooknum == NF_INET_PRE_ROUTING ||
+ hooknum == NF_INET_POST_ROUTING ||
+ hooknum == NF_INET_LOCAL_IN ||
+ hooknum == NF_INET_LOCAL_OUT);
BUG_ON(nf_nat_initialized(ct, maniptype));
/* What we've got will look like inverse of reply. Normally
srchash = hash_by_src(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
write_lock_bh(&nf_nat_lock);
- list_add(&info->bysource, &bysource[srchash]);
+ /* nf_conntrack_alter_reply might re-allocate exntension aera */
+ nat = nfct_nat(ct);
+ nat->ct = ct;
+ hlist_add_head(&nat->bysource, &bysource[srchash]);
write_unlock_bh(&nf_nat_lock);
}
/* Returns true if succeeded. */
static int
manip_pkt(u_int16_t proto,
- struct sk_buff **pskb,
+ struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_conntrack_tuple *target,
enum nf_nat_manip_type maniptype)
struct iphdr *iph;
struct nf_nat_protocol *p;
- if (!skb_make_writable(pskb, iphdroff + sizeof(*iph)))
+ if (!skb_make_writable(skb, iphdroff + sizeof(*iph)))
return 0;
- iph = (void *)(*pskb)->data + iphdroff;
+ iph = (void *)skb->data + iphdroff;
/* Manipulate protcol part. */
- p = nf_nat_proto_find_get(proto);
- if (!p->manip_pkt(pskb, iphdroff, target, maniptype)) {
- nf_nat_proto_put(p);
+
+ /* rcu_read_lock()ed by nf_hook_slow */
+ p = __nf_nat_proto_find(proto);
+ if (!p->manip_pkt(skb, iphdroff, target, maniptype))
return 0;
- }
- nf_nat_proto_put(p);
- iph = (void *)(*pskb)->data + iphdroff;
+ iph = (void *)skb->data + iphdroff;
if (maniptype == IP_NAT_MANIP_SRC) {
nf_csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
unsigned int nf_nat_packet(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int hooknum,
- struct sk_buff **pskb)
+ struct sk_buff *skb)
{
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
unsigned long statusbit;
/* We are aiming to look like inverse of other direction. */
nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
- if (!manip_pkt(target.dst.protonum, pskb, 0, &target, mtype))
+ if (!manip_pkt(target.dst.protonum, skb, 0, &target, mtype))
return NF_DROP;
}
return NF_ACCEPT;
int nf_nat_icmp_reply_translation(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int hooknum,
- struct sk_buff **pskb)
+ struct sk_buff *skb)
{
struct {
struct icmphdr icmp;
struct iphdr ip;
} *inside;
+ struct nf_conntrack_l4proto *l4proto;
struct nf_conntrack_tuple inner, target;
- int hdrlen = (*pskb)->nh.iph->ihl * 4;
+ int hdrlen = ip_hdrlen(skb);
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
unsigned long statusbit;
enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
- if (!skb_make_writable(pskb, hdrlen + sizeof(*inside)))
+ if (!skb_make_writable(skb, hdrlen + sizeof(*inside)))
return 0;
- inside = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+ inside = (void *)skb->data + ip_hdrlen(skb);
/* We're actually going to mangle it beyond trivial checksum
adjustment, so make sure the current checksum is correct. */
- if (nf_ip_checksum(*pskb, hooknum, hdrlen, 0))
+ if (nf_ip_checksum(skb, hooknum, hdrlen, 0))
return 0;
/* Must be RELATED */
- NF_CT_ASSERT((*pskb)->nfctinfo == IP_CT_RELATED ||
- (*pskb)->nfctinfo == IP_CT_RELATED+IP_CT_IS_REPLY);
+ NF_CT_ASSERT(skb->nfctinfo == IP_CT_RELATED ||
+ skb->nfctinfo == IP_CT_RELATED+IP_CT_IS_REPLY);
/* Redirects on non-null nats must be dropped, else they'll
- start talking to each other without our translation, and be
- confused... --RR */
+ start talking to each other without our translation, and be
+ confused... --RR */
if (inside->icmp.type == ICMP_REDIRECT) {
/* If NAT isn't finished, assume it and drop. */
if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
return 0;
}
- DEBUGP("icmp_reply_translation: translating error %p manp %u dir %s\n",
- *pskb, manip, dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
-
- if (!nf_ct_get_tuple(*pskb,
- (*pskb)->nh.iph->ihl*4 + sizeof(struct icmphdr),
- (*pskb)->nh.iph->ihl*4 +
- sizeof(struct icmphdr) + inside->ip.ihl*4,
- (u_int16_t)AF_INET,
- inside->ip.protocol,
- &inner,
- l3proto,
- __nf_ct_l4proto_find((u_int16_t)PF_INET,
- inside->ip.protocol)))
+ pr_debug("icmp_reply_translation: translating error %p manip %u "
+ "dir %s\n", skb, manip,
+ dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
+
+ /* rcu_read_lock()ed by nf_hook_slow */
+ l4proto = __nf_ct_l4proto_find(PF_INET, inside->ip.protocol);
+
+ if (!nf_ct_get_tuple(skb,
+ ip_hdrlen(skb) + sizeof(struct icmphdr),
+ (ip_hdrlen(skb) +
+ sizeof(struct icmphdr) + inside->ip.ihl * 4),
+ (u_int16_t)AF_INET,
+ inside->ip.protocol,
+ &inner, l3proto, l4proto))
return 0;
/* Change inner back to look like incoming packet. We do the
pass all hooks (locally-generated ICMP). Consider incoming
packet: PREROUTING (DST manip), routing produces ICMP, goes
through POSTROUTING (which must correct the DST manip). */
- if (!manip_pkt(inside->ip.protocol, pskb,
- (*pskb)->nh.iph->ihl*4 + sizeof(inside->icmp),
+ if (!manip_pkt(inside->ip.protocol, skb,
+ ip_hdrlen(skb) + sizeof(inside->icmp),
&ct->tuplehash[!dir].tuple,
!manip))
return 0;
- if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
+ if (skb->ip_summed != CHECKSUM_PARTIAL) {
/* Reloading "inside" here since manip_pkt inner. */
- inside = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+ inside = (void *)skb->data + ip_hdrlen(skb);
inside->icmp.checksum = 0;
inside->icmp.checksum =
- csum_fold(skb_checksum(*pskb, hdrlen,
- (*pskb)->len - hdrlen, 0));
+ csum_fold(skb_checksum(skb, hdrlen,
+ skb->len - hdrlen, 0));
}
/* Change outer to look the reply to an incoming packet
if (ct->status & statusbit) {
nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
- if (!manip_pkt(0, pskb, 0, &target, manip))
+ if (!manip_pkt(0, skb, 0, &target, manip))
return 0;
}
ret = -EBUSY;
goto out;
}
- nf_nat_protos[proto->protonum] = proto;
+ rcu_assign_pointer(nf_nat_protos[proto->protonum], proto);
out:
write_unlock_bh(&nf_nat_lock);
return ret;
void nf_nat_protocol_unregister(struct nf_nat_protocol *proto)
{
write_lock_bh(&nf_nat_lock);
- nf_nat_protos[proto->protonum] = &nf_nat_unknown_protocol;
+ rcu_assign_pointer(nf_nat_protos[proto->protonum],
+ &nf_nat_unknown_protocol);
write_unlock_bh(&nf_nat_lock);
-
- /* Someone could be still looking at the proto in a bh. */
- synchronize_net();
+ synchronize_rcu();
}
EXPORT_SYMBOL(nf_nat_protocol_unregister);
-#if defined(CONFIG_IP_NF_CONNTRACK_NETLINK) || \
- defined(CONFIG_IP_NF_CONNTRACK_NETLINK_MODULE)
+#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
int
-nf_nat_port_range_to_nfattr(struct sk_buff *skb,
+nf_nat_port_range_to_nlattr(struct sk_buff *skb,
const struct nf_nat_range *range)
{
- NFA_PUT(skb, CTA_PROTONAT_PORT_MIN, sizeof(__be16),
+ NLA_PUT(skb, CTA_PROTONAT_PORT_MIN, sizeof(__be16),
&range->min.tcp.port);
- NFA_PUT(skb, CTA_PROTONAT_PORT_MAX, sizeof(__be16),
+ NLA_PUT(skb, CTA_PROTONAT_PORT_MAX, sizeof(__be16),
&range->max.tcp.port);
return 0;
-nfattr_failure:
+nla_put_failure:
return -1;
}
-EXPORT_SYMBOL_GPL(nf_nat_port_nfattr_to_range);
+EXPORT_SYMBOL_GPL(nf_nat_port_nlattr_to_range);
int
-nf_nat_port_nfattr_to_range(struct nfattr *tb[], struct nf_nat_range *range)
+nf_nat_port_nlattr_to_range(struct nlattr *tb[], struct nf_nat_range *range)
{
int ret = 0;
/* we have to return whether we actually parsed something or not */
- if (tb[CTA_PROTONAT_PORT_MIN-1]) {
+ if (tb[CTA_PROTONAT_PORT_MIN]) {
ret = 1;
range->min.tcp.port =
- *(__be16 *)NFA_DATA(tb[CTA_PROTONAT_PORT_MIN-1]);
+ *(__be16 *)nla_data(tb[CTA_PROTONAT_PORT_MIN]);
}
- if (!tb[CTA_PROTONAT_PORT_MAX-1]) {
+ if (!tb[CTA_PROTONAT_PORT_MAX]) {
if (ret)
range->max.tcp.port = range->min.tcp.port;
} else {
ret = 1;
range->max.tcp.port =
- *(__be16 *)NFA_DATA(tb[CTA_PROTONAT_PORT_MAX-1]);
+ *(__be16 *)nla_data(tb[CTA_PROTONAT_PORT_MAX]);
}
return ret;
}
-EXPORT_SYMBOL_GPL(nf_nat_port_range_to_nfattr);
+EXPORT_SYMBOL_GPL(nf_nat_port_range_to_nlattr);
#endif
+/* Noone using conntrack by the time this called. */
+static void nf_nat_cleanup_conntrack(struct nf_conn *ct)
+{
+ struct nf_conn_nat *nat = nf_ct_ext_find(ct, NF_CT_EXT_NAT);
+
+ if (nat == NULL || nat->ct == NULL)
+ return;
+
+ NF_CT_ASSERT(nat->ct->status & IPS_NAT_DONE_MASK);
+
+ write_lock_bh(&nf_nat_lock);
+ hlist_del(&nat->bysource);
+ nat->ct = NULL;
+ write_unlock_bh(&nf_nat_lock);
+}
+
+static void nf_nat_move_storage(struct nf_conn *conntrack, void *old)
+{
+ struct nf_conn_nat *new_nat = nf_ct_ext_find(conntrack, NF_CT_EXT_NAT);
+ struct nf_conn_nat *old_nat = (struct nf_conn_nat *)old;
+ struct nf_conn *ct = old_nat->ct;
+
+ if (!ct || !(ct->status & IPS_NAT_DONE_MASK))
+ return;
+
+ write_lock_bh(&nf_nat_lock);
+ hlist_replace_rcu(&old_nat->bysource, &new_nat->bysource);
+ new_nat->ct = ct;
+ write_unlock_bh(&nf_nat_lock);
+}
+
+static struct nf_ct_ext_type nat_extend __read_mostly = {
+ .len = sizeof(struct nf_conn_nat),
+ .align = __alignof__(struct nf_conn_nat),
+ .destroy = nf_nat_cleanup_conntrack,
+ .move = nf_nat_move_storage,
+ .id = NF_CT_EXT_NAT,
+ .flags = NF_CT_EXT_F_PREALLOC,
+};
+
static int __init nf_nat_init(void)
{
size_t i;
+ int ret;
+
+ ret = nf_ct_extend_register(&nat_extend);
+ if (ret < 0) {
+ printk(KERN_ERR "nf_nat_core: Unable to register extension\n");
+ return ret;
+ }
/* Leave them the same for the moment. */
nf_nat_htable_size = nf_conntrack_htable_size;
- /* One vmalloc for both hash tables */
- bysource = vmalloc(sizeof(struct list_head) * nf_nat_htable_size);
- if (!bysource)
- return -ENOMEM;
+ bysource = nf_ct_alloc_hashtable(&nf_nat_htable_size,
+ &nf_nat_vmalloced);
+ if (!bysource) {
+ ret = -ENOMEM;
+ goto cleanup_extend;
+ }
/* Sew in builtin protocols. */
write_lock_bh(&nf_nat_lock);
for (i = 0; i < MAX_IP_NAT_PROTO; i++)
- nf_nat_protos[i] = &nf_nat_unknown_protocol;
- nf_nat_protos[IPPROTO_TCP] = &nf_nat_protocol_tcp;
- nf_nat_protos[IPPROTO_UDP] = &nf_nat_protocol_udp;
- nf_nat_protos[IPPROTO_ICMP] = &nf_nat_protocol_icmp;
+ rcu_assign_pointer(nf_nat_protos[i], &nf_nat_unknown_protocol);
+ rcu_assign_pointer(nf_nat_protos[IPPROTO_TCP], &nf_nat_protocol_tcp);
+ rcu_assign_pointer(nf_nat_protos[IPPROTO_UDP], &nf_nat_protocol_udp);
+ rcu_assign_pointer(nf_nat_protos[IPPROTO_ICMP], &nf_nat_protocol_icmp);
write_unlock_bh(&nf_nat_lock);
for (i = 0; i < nf_nat_htable_size; i++) {
- INIT_LIST_HEAD(&bysource[i]);
+ INIT_HLIST_HEAD(&bysource[i]);
}
- /* FIXME: Man, this is a hack. <SIGH> */
- NF_CT_ASSERT(nf_conntrack_destroyed == NULL);
- nf_conntrack_destroyed = &nf_nat_cleanup_conntrack;
-
/* Initialize fake conntrack so that NAT will skip it */
nf_conntrack_untracked.status |= IPS_NAT_DONE_MASK;
l3proto = nf_ct_l3proto_find_get((u_int16_t)AF_INET);
return 0;
+
+ cleanup_extend:
+ nf_ct_extend_unregister(&nat_extend);
+ return ret;
}
/* Clear NAT section of all conntracks, in case we're loaded again. */
if (!nat)
return 0;
- memset(nat, 0, sizeof(nat));
+ memset(nat, 0, sizeof(*nat));
i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
return 0;
}
static void __exit nf_nat_cleanup(void)
{
nf_ct_iterate_cleanup(&clean_nat, NULL);
- nf_conntrack_destroyed = NULL;
- vfree(bysource);
+ synchronize_rcu();
+ nf_ct_free_hashtable(bysource, nf_nat_vmalloced, nf_nat_htable_size);
nf_ct_l3proto_put(l3proto);
+ nf_ct_extend_unregister(&nat_extend);
}
MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff