enum ip_conntrack_info ctinfo,
unsigned int hooknum, unsigned int hdrlen);
+unsigned int nf_nat_ipv6_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_ipv6_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_ipv6_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_ipv6_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));
+
#endif /* _NF_NAT_L3PROTO_H */
.af = NFPROTO_IPV6,
};
-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 (%pI6)\n", ct,
- HOOK2MANIP(hooknum) == NF_NAT_MANIP_SRC ?
- &ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip6 :
- &ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip6);
-
- 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 ip6table_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 = ip6t_do_table(skb, hooknum, in, out, net->ipv6.ip6table_nat);
- if (ret == NF_ACCEPT) {
- if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum)))
- ret = alloc_null_binding(ct, hooknum);
- }
- return ret;
+ return ip6t_do_table(skb, ops->hooknum, in, out, net->ipv6.ip6table_nat);
}
-static unsigned int
-nf_nat_ipv6_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 ip6table_nat_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;
- enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
- __be16 frag_off;
- int hdrlen;
- u8 nexthdr;
-
- 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:
- nexthdr = ipv6_hdr(skb)->nexthdr;
- hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
- &nexthdr, &frag_off);
-
- if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
- if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
- ops->hooknum,
- hdrlen))
- 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_ipv6_fn(ops, skb, in, out, ip6table_nat_do_chain);
}
-static unsigned int
-nf_nat_ipv6_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 ip6table_nat_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;
- struct in6_addr daddr = ipv6_hdr(skb)->daddr;
-
- ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
- if (ret != NF_DROP && ret != NF_STOLEN &&
- ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
- skb_dst_drop(skb);
-
- return ret;
+ return nf_nat_ipv6_in(ops, skb, in, out, ip6table_nat_do_chain);
}
-static unsigned int
-nf_nat_ipv6_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 ip6table_nat_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 ipv6hdr))
- return NF_ACCEPT;
-
- ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
-#ifdef CONFIG_XFRM
- if (ret != NF_DROP && ret != NF_STOLEN &&
- !(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
- (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
- enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
-
- if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
- &ct->tuplehash[!dir].tuple.dst.u3) ||
- (ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
- ct->tuplehash[dir].tuple.src.u.all !=
- ct->tuplehash[!dir].tuple.dst.u.all)) {
- err = nf_xfrm_me_harder(skb, AF_INET6);
- if (err < 0)
- ret = NF_DROP_ERR(err);
- }
- }
-#endif
- return ret;
+ return nf_nat_ipv6_out(ops, skb, in, out, ip6table_nat_do_chain);
}
-static unsigned int
-nf_nat_ipv6_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 ip6table_nat_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 ipv6hdr))
- return NF_ACCEPT;
-
- ret = nf_nat_ipv6_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 (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
- &ct->tuplehash[!dir].tuple.src.u3)) {
- err = ip6_route_me_harder(skb);
- if (err < 0)
- ret = NF_DROP_ERR(err);
- }
-#ifdef CONFIG_XFRM
- else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
- ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
- ct->tuplehash[dir].tuple.dst.u.all !=
- ct->tuplehash[!dir].tuple.src.u.all) {
- err = nf_xfrm_me_harder(skb, AF_INET6);
- if (err < 0)
- ret = NF_DROP_ERR(err);
- }
-#endif
- }
- return ret;
+ return nf_nat_ipv6_local_fn(ops, skb, in, out, ip6table_nat_do_chain);
}
static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = {
/* Before packet filtering, change destination */
{
- .hook = nf_nat_ipv6_in,
+ .hook = ip6table_nat_in,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_PRE_ROUTING,
},
/* After packet filtering, change source */
{
- .hook = nf_nat_ipv6_out,
+ .hook = ip6table_nat_out,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_POST_ROUTING,
},
/* Before packet filtering, change destination */
{
- .hook = nf_nat_ipv6_local_fn,
+ .hook = ip6table_nat_local_fn,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_OUT,
},
/* After packet filtering, change source */
{
- .hook = nf_nat_ipv6_fn,
+ .hook = ip6table_nat_fn,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_IN,
}
EXPORT_SYMBOL_GPL(nf_nat_icmpv6_reply_translation);
+unsigned int
+nf_nat_ipv6_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;
+ enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
+ __be16 frag_off;
+ int hdrlen;
+ u8 nexthdr;
+
+ 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:
+ nexthdr = ipv6_hdr(skb)->nexthdr;
+ hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
+ &nexthdr, &frag_off);
+
+ if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
+ if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
+ ops->hooknum,
+ hdrlen))
+ 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_ipv6_fn);
+
+unsigned int
+nf_nat_ipv6_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;
+ struct in6_addr daddr = ipv6_hdr(skb)->daddr;
+
+ ret = nf_nat_ipv6_fn(ops, skb, in, out, do_chain);
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
+ skb_dst_drop(skb);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_nat_ipv6_in);
+
+unsigned int
+nf_nat_ipv6_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 ipv6hdr))
+ return NF_ACCEPT;
+
+ ret = nf_nat_ipv6_fn(ops, skb, in, out, do_chain);
+#ifdef CONFIG_XFRM
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ !(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+
+ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
+ &ct->tuplehash[!dir].tuple.dst.u3) ||
+ (ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
+ ct->tuplehash[dir].tuple.src.u.all !=
+ ct->tuplehash[!dir].tuple.dst.u.all)) {
+ err = nf_xfrm_me_harder(skb, AF_INET6);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);
+ }
+ }
+#endif
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_nat_ipv6_out);
+
+unsigned int
+nf_nat_ipv6_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 ipv6hdr))
+ return NF_ACCEPT;
+
+ ret = nf_nat_ipv6_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 (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
+ &ct->tuplehash[!dir].tuple.src.u3)) {
+ err = ip6_route_me_harder(skb);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);
+ }
+#ifdef CONFIG_XFRM
+ else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
+ ct->tuplehash[dir].tuple.dst.u.all !=
+ ct->tuplehash[!dir].tuple.src.u.all) {
+ err = nf_xfrm_me_harder(skb, AF_INET6);
+ if (err < 0)
+ ret = NF_DROP_ERR(err);
+ }
+#endif
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_nat_ipv6_local_fn);
+
static int __init nf_nat_l3proto_ipv6_init(void)
{
int err;
* IPv6 NAT chains
*/
-static unsigned int nf_nat_ipv6_fn(const struct nf_hook_ops *ops,
+static unsigned int nft_nat_ipv6_fn(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
struct in6_addr daddr = ipv6_hdr(skb)->daddr;
unsigned int ret;
- ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
+ ret = nft_nat_ipv6_fn(ops, skb, in, out, okfn);
if (ret != NF_DROP && ret != NF_STOLEN &&
ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
skb_dst_drop(skb);
const struct nf_conn *ct __maybe_unused;
unsigned int ret;
- ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
+ ret = nft_nat_ipv6_fn(ops, skb, in, out, okfn);
#ifdef CONFIG_XFRM
if (ret != NF_DROP && ret != NF_STOLEN &&
!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
const struct nf_conn *ct;
unsigned int ret;
- ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
+ ret = nft_nat_ipv6_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);
[NF_INET_PRE_ROUTING] = nf_nat_ipv6_prerouting,
[NF_INET_POST_ROUTING] = nf_nat_ipv6_postrouting,
[NF_INET_LOCAL_OUT] = nf_nat_ipv6_output,
- [NF_INET_LOCAL_IN] = nf_nat_ipv6_fn,
+ [NF_INET_LOCAL_IN] = nft_nat_ipv6_fn,
},
};
projects / kernel.git / commitdiff