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netfilter: nat: move specific NAT IPv6 to core
Move the specific NAT IPv6 core functions that are called from the hooks from ip6table_nat.c to nf_nat_l3proto_ipv6.c. This prepares the ground to allow iptables and nft to use the same NAT engine code that comes in a follow up patch. This also renames nf_nat_ipv6_fn to nft_nat_ipv6_fn in net/ipv6/netfilter/nft_chain_nat_ipv6.c to avoid a compilation breakage. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
parent
65cd90ac76
commit
2a5538e9aa
@ -84,4 +84,41 @@ int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int hooknum, unsigned int hdrlen);
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unsigned int nf_nat_ipv6_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int (*do_chain)(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct));
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unsigned int nf_nat_ipv6_out(const struct nf_hook_ops *ops, struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int (*do_chain)(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct));
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unsigned int nf_nat_ipv6_local_fn(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int (*do_chain)(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct));
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unsigned int nf_nat_ipv6_fn(const struct nf_hook_ops *ops, struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int (*do_chain)(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct));
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#endif /* _NF_NAT_L3PROTO_H */
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@ -30,222 +30,57 @@ static const struct xt_table nf_nat_ipv6_table = {
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.af = NFPROTO_IPV6,
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};
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static unsigned int alloc_null_binding(struct nf_conn *ct, unsigned int hooknum)
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{
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/* Force range to this IP; let proto decide mapping for
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* per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED).
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*/
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struct nf_nat_range range;
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range.flags = 0;
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pr_debug("Allocating NULL binding for %p (%pI6)\n", ct,
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HOOK2MANIP(hooknum) == NF_NAT_MANIP_SRC ?
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&ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip6 :
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&ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip6);
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return nf_nat_setup_info(ct, &range, HOOK2MANIP(hooknum));
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}
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static unsigned int nf_nat_rule_find(struct sk_buff *skb, unsigned int hooknum,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct)
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static unsigned int ip6table_nat_do_chain(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct)
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{
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struct net *net = nf_ct_net(ct);
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unsigned int ret;
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ret = ip6t_do_table(skb, hooknum, in, out, net->ipv6.ip6table_nat);
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if (ret == NF_ACCEPT) {
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if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum)))
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ret = alloc_null_binding(ct, hooknum);
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}
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return ret;
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return ip6t_do_table(skb, ops->hooknum, in, out, net->ipv6.ip6table_nat);
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}
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static unsigned int
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nf_nat_ipv6_fn(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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static unsigned int ip6table_nat_fn(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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struct nf_conn_nat *nat;
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enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
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__be16 frag_off;
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int hdrlen;
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u8 nexthdr;
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ct = nf_ct_get(skb, &ctinfo);
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/* Can't track? It's not due to stress, or conntrack would
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* have dropped it. Hence it's the user's responsibilty to
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* packet filter it out, or implement conntrack/NAT for that
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* protocol. 8) --RR
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*/
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if (!ct)
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return NF_ACCEPT;
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/* Don't try to NAT if this packet is not conntracked */
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if (nf_ct_is_untracked(ct))
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return NF_ACCEPT;
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nat = nf_ct_nat_ext_add(ct);
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if (nat == NULL)
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return NF_ACCEPT;
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switch (ctinfo) {
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case IP_CT_RELATED:
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case IP_CT_RELATED_REPLY:
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nexthdr = ipv6_hdr(skb)->nexthdr;
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hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
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&nexthdr, &frag_off);
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if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
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if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
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ops->hooknum,
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hdrlen))
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return NF_DROP;
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else
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return NF_ACCEPT;
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}
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/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
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case IP_CT_NEW:
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/* Seen it before? This can happen for loopback, retrans,
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* or local packets.
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*/
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if (!nf_nat_initialized(ct, maniptype)) {
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unsigned int ret;
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ret = nf_nat_rule_find(skb, ops->hooknum, in, out, ct);
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if (ret != NF_ACCEPT)
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return ret;
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} else {
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pr_debug("Already setup manip %s for ct %p\n",
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maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST",
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ct);
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if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
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goto oif_changed;
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}
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break;
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default:
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/* ESTABLISHED */
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NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED ||
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ctinfo == IP_CT_ESTABLISHED_REPLY);
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if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
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goto oif_changed;
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}
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return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
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oif_changed:
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nf_ct_kill_acct(ct, ctinfo, skb);
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return NF_DROP;
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return nf_nat_ipv6_fn(ops, skb, in, out, ip6table_nat_do_chain);
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}
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static unsigned int
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nf_nat_ipv6_in(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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static unsigned int ip6table_nat_in(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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unsigned int ret;
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struct in6_addr daddr = ipv6_hdr(skb)->daddr;
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ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
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if (ret != NF_DROP && ret != NF_STOLEN &&
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ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
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skb_dst_drop(skb);
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return ret;
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return nf_nat_ipv6_in(ops, skb, in, out, ip6table_nat_do_chain);
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}
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static unsigned int
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nf_nat_ipv6_out(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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static unsigned int ip6table_nat_out(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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#ifdef CONFIG_XFRM
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const struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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int err;
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#endif
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unsigned int ret;
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/* root is playing with raw sockets. */
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if (skb->len < sizeof(struct ipv6hdr))
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return NF_ACCEPT;
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ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
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#ifdef CONFIG_XFRM
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if (ret != NF_DROP && ret != NF_STOLEN &&
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!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
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(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
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enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
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if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
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&ct->tuplehash[!dir].tuple.dst.u3) ||
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(ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
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ct->tuplehash[dir].tuple.src.u.all !=
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ct->tuplehash[!dir].tuple.dst.u.all)) {
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err = nf_xfrm_me_harder(skb, AF_INET6);
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if (err < 0)
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ret = NF_DROP_ERR(err);
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}
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}
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#endif
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return ret;
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return nf_nat_ipv6_out(ops, skb, in, out, ip6table_nat_do_chain);
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}
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static unsigned int
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nf_nat_ipv6_local_fn(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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static unsigned int ip6table_nat_local_fn(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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const struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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unsigned int ret;
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int err;
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/* root is playing with raw sockets. */
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if (skb->len < sizeof(struct ipv6hdr))
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return NF_ACCEPT;
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ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
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if (ret != NF_DROP && ret != NF_STOLEN &&
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(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
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enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
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if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
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&ct->tuplehash[!dir].tuple.src.u3)) {
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err = ip6_route_me_harder(skb);
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if (err < 0)
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ret = NF_DROP_ERR(err);
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}
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#ifdef CONFIG_XFRM
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else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
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ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMPV6 &&
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ct->tuplehash[dir].tuple.dst.u.all !=
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ct->tuplehash[!dir].tuple.src.u.all) {
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err = nf_xfrm_me_harder(skb, AF_INET6);
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if (err < 0)
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ret = NF_DROP_ERR(err);
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}
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#endif
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}
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return ret;
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return nf_nat_ipv6_local_fn(ops, skb, in, out, ip6table_nat_do_chain);
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}
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static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = {
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/* Before packet filtering, change destination */
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{
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.hook = nf_nat_ipv6_in,
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.hook = ip6table_nat_in,
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.owner = THIS_MODULE,
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.pf = NFPROTO_IPV6,
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.hooknum = NF_INET_PRE_ROUTING,
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@ -253,7 +88,7 @@ static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = {
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},
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/* After packet filtering, change source */
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{
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.hook = nf_nat_ipv6_out,
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.hook = ip6table_nat_out,
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.owner = THIS_MODULE,
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.pf = NFPROTO_IPV6,
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.hooknum = NF_INET_POST_ROUTING,
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@ -261,7 +96,7 @@ static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = {
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},
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/* Before packet filtering, change destination */
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{
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.hook = nf_nat_ipv6_local_fn,
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.hook = ip6table_nat_local_fn,
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.owner = THIS_MODULE,
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.pf = NFPROTO_IPV6,
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.hooknum = NF_INET_LOCAL_OUT,
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@ -269,7 +104,7 @@ static struct nf_hook_ops nf_nat_ipv6_ops[] __read_mostly = {
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},
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/* After packet filtering, change source */
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{
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.hook = nf_nat_ipv6_fn,
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.hook = ip6table_nat_fn,
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.owner = THIS_MODULE,
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.pf = NFPROTO_IPV6,
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.hooknum = NF_INET_LOCAL_IN,
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@ -261,6 +261,205 @@ int nf_nat_icmpv6_reply_translation(struct sk_buff *skb,
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}
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EXPORT_SYMBOL_GPL(nf_nat_icmpv6_reply_translation);
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unsigned int
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nf_nat_ipv6_fn(const struct nf_hook_ops *ops, struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out,
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unsigned int (*do_chain)(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct))
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{
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struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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struct nf_conn_nat *nat;
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enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
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__be16 frag_off;
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int hdrlen;
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u8 nexthdr;
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ct = nf_ct_get(skb, &ctinfo);
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/* Can't track? It's not due to stress, or conntrack would
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* have dropped it. Hence it's the user's responsibilty to
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* packet filter it out, or implement conntrack/NAT for that
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* protocol. 8) --RR
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*/
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if (!ct)
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return NF_ACCEPT;
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/* Don't try to NAT if this packet is not conntracked */
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if (nf_ct_is_untracked(ct))
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return NF_ACCEPT;
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nat = nf_ct_nat_ext_add(ct);
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if (nat == NULL)
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return NF_ACCEPT;
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switch (ctinfo) {
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case IP_CT_RELATED:
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case IP_CT_RELATED_REPLY:
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nexthdr = ipv6_hdr(skb)->nexthdr;
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hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
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&nexthdr, &frag_off);
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if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
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if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
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ops->hooknum,
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hdrlen))
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return NF_DROP;
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else
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return NF_ACCEPT;
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}
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/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
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case IP_CT_NEW:
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/* Seen it before? This can happen for loopback, retrans,
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* or local packets.
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*/
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if (!nf_nat_initialized(ct, maniptype)) {
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unsigned int ret;
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ret = do_chain(ops, skb, in, out, ct);
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if (ret != NF_ACCEPT)
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return ret;
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if (nf_nat_initialized(ct, HOOK2MANIP(ops->hooknum)))
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break;
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ret = nf_nat_alloc_null_binding(ct, ops->hooknum);
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if (ret != NF_ACCEPT)
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return ret;
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} else {
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pr_debug("Already setup manip %s for ct %p\n",
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maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST",
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ct);
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if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
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goto oif_changed;
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}
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break;
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default:
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/* ESTABLISHED */
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NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED ||
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ctinfo == IP_CT_ESTABLISHED_REPLY);
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if (nf_nat_oif_changed(ops->hooknum, ctinfo, nat, out))
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goto oif_changed;
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}
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return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
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oif_changed:
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nf_ct_kill_acct(ct, ctinfo, skb);
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return NF_DROP;
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}
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EXPORT_SYMBOL_GPL(nf_nat_ipv6_fn);
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unsigned int
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nf_nat_ipv6_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
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const struct net_device *in, const struct net_device *out,
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||||
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;
|
||||
|
@ -28,7 +28,7 @@
|
||||
* 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,
|
||||
@ -97,7 +97,7 @@ static unsigned int nf_nat_ipv6_prerouting(const struct nf_hook_ops *ops,
|
||||
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);
|
||||
@ -115,7 +115,7 @@ static unsigned int nf_nat_ipv6_postrouting(const struct nf_hook_ops *ops,
|
||||
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) &&
|
||||
@ -143,7 +143,7 @@ static unsigned int nf_nat_ipv6_output(const struct nf_hook_ops *ops,
|
||||
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);
|
||||
@ -177,7 +177,7 @@ static const struct nf_chain_type nft_chain_nat_ipv6 = {
|
||||
[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,
|
||||
},
|
||||
};
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user