Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv6 / netfilter / ip6table_mangle.c

diff --git a/kernel/net/ipv6/netfilter/ip6table_mangle.c b/kernel/net/ipv6/netfilter/ip6table_mangle.c
new file mode 100644 (file)
index 0000000..b551f5b
--- /dev/null
+++ b/kernel/net/ipv6/netfilter/ip6table_mangle.c
@@ -0,0 +1,145 @@
+/*
+ * IPv6 packet mangling table, a port of the IPv4 mangle table to IPv6
+ *
+ * Copyright (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/slab.h>
+#include <net/ipv6.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("ip6tables mangle table");
+
+#define MANGLE_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
+                           (1 << NF_INET_LOCAL_IN) | \
+                           (1 << NF_INET_FORWARD) | \
+                           (1 << NF_INET_LOCAL_OUT) | \
+                           (1 << NF_INET_POST_ROUTING))
+
+static const struct xt_table packet_mangler = {
+       .name           = "mangle",
+       .valid_hooks    = MANGLE_VALID_HOOKS,
+       .me             = THIS_MODULE,
+       .af             = NFPROTO_IPV6,
+       .priority       = NF_IP6_PRI_MANGLE,
+};
+
+static unsigned int
+ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
+{
+       unsigned int ret;
+       struct in6_addr saddr, daddr;
+       u_int8_t hop_limit;
+       u_int32_t flowlabel, mark;
+       int err;
+#if 0
+       /* root is playing with raw sockets. */
+       if (skb->len < sizeof(struct iphdr) ||
+           ip_hdrlen(skb) < sizeof(struct iphdr)) {
+               net_warn_ratelimited("ip6t_hook: happy cracking\n");
+               return NF_ACCEPT;
+       }
+#endif
+
+       /* save source/dest address, mark, hoplimit, flowlabel, priority,  */
+       memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
+       memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
+       mark = skb->mark;
+       hop_limit = ipv6_hdr(skb)->hop_limit;
+
+       /* flowlabel and prio (includes version, which shouldn't change either */
+       flowlabel = *((u_int32_t *)ipv6_hdr(skb));
+
+       ret = ip6t_do_table(skb, NF_INET_LOCAL_OUT, state,
+                           dev_net(state->out)->ipv6.ip6table_mangle);
+
+       if (ret != NF_DROP && ret != NF_STOLEN &&
+           (!ipv6_addr_equal(&ipv6_hdr(skb)->saddr, &saddr) ||
+            !ipv6_addr_equal(&ipv6_hdr(skb)->daddr, &daddr) ||
+            skb->mark != mark ||
+            ipv6_hdr(skb)->hop_limit != hop_limit ||
+            flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
+               err = ip6_route_me_harder(skb);
+               if (err < 0)
+                       ret = NF_DROP_ERR(err);
+       }
+
+       return ret;
+}
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ip6table_mangle_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
+                    const struct nf_hook_state *state)
+{
+       if (ops->hooknum == NF_INET_LOCAL_OUT)
+               return ip6t_mangle_out(skb, state);
+       if (ops->hooknum == NF_INET_POST_ROUTING)
+               return ip6t_do_table(skb, ops->hooknum, state,
+                                    dev_net(state->out)->ipv6.ip6table_mangle);
+       /* INPUT/FORWARD */
+       return ip6t_do_table(skb, ops->hooknum, state,
+                            dev_net(state->in)->ipv6.ip6table_mangle);
+}
+
+static struct nf_hook_ops *mangle_ops __read_mostly;
+static int __net_init ip6table_mangle_net_init(struct net *net)
+{
+       struct ip6t_replace *repl;
+
+       repl = ip6t_alloc_initial_table(&packet_mangler);
+       if (repl == NULL)
+               return -ENOMEM;
+       net->ipv6.ip6table_mangle =
+               ip6t_register_table(net, &packet_mangler, repl);
+       kfree(repl);
+       return PTR_ERR_OR_ZERO(net->ipv6.ip6table_mangle);
+}
+
+static void __net_exit ip6table_mangle_net_exit(struct net *net)
+{
+       ip6t_unregister_table(net, net->ipv6.ip6table_mangle);
+}
+
+static struct pernet_operations ip6table_mangle_net_ops = {
+       .init = ip6table_mangle_net_init,
+       .exit = ip6table_mangle_net_exit,
+};
+
+static int __init ip6table_mangle_init(void)
+{
+       int ret;
+
+       ret = register_pernet_subsys(&ip6table_mangle_net_ops);
+       if (ret < 0)
+               return ret;
+
+       /* Register hooks */
+       mangle_ops = xt_hook_link(&packet_mangler, ip6table_mangle_hook);
+       if (IS_ERR(mangle_ops)) {
+               ret = PTR_ERR(mangle_ops);
+               goto cleanup_table;
+       }
+
+       return ret;
+
+ cleanup_table:
+       unregister_pernet_subsys(&ip6table_mangle_net_ops);
+       return ret;
+}
+
+static void __exit ip6table_mangle_fini(void)
+{
+       xt_hook_unlink(&packet_mangler, mangle_ops);
+       unregister_pernet_subsys(&ip6table_mangle_net_ops);
+}
+
+module_init(ip6table_mangle_init);
+module_exit(ip6table_mangle_fini);