diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/net/ipv4/netfilter/iptable_mangle.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/net/ipv4/netfilter/iptable_mangle.c')
-rw-r--r-- | kernel/net/ipv4/netfilter/iptable_mangle.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/kernel/net/ipv4/netfilter/iptable_mangle.c b/kernel/net/ipv4/netfilter/iptable_mangle.c new file mode 100644 index 000000000..62cbb8c5f --- /dev/null +++ b/kernel/net/ipv4/netfilter/iptable_mangle.c @@ -0,0 +1,147 @@ +/* + * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x. + * + * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling + * 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_ipv4/ip_tables.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <net/sock.h> +#include <net/route.h> +#include <linux/ip.h> +#include <net/ip.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); +MODULE_DESCRIPTION("iptables 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_IPV4, + .priority = NF_IP_PRI_MANGLE, +}; + +static unsigned int +ipt_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state) +{ + struct net_device *out = state->out; + unsigned int ret; + const struct iphdr *iph; + u_int8_t tos; + __be32 saddr, daddr; + u_int32_t mark; + int err; + + /* root is playing with raw sockets. */ + if (skb->len < sizeof(struct iphdr) || + ip_hdrlen(skb) < sizeof(struct iphdr)) + return NF_ACCEPT; + + /* Save things which could affect route */ + mark = skb->mark; + iph = ip_hdr(skb); + saddr = iph->saddr; + daddr = iph->daddr; + tos = iph->tos; + + ret = ipt_do_table(skb, NF_INET_LOCAL_OUT, state, + dev_net(out)->ipv4.iptable_mangle); + /* Reroute for ANY change. */ + if (ret != NF_DROP && ret != NF_STOLEN) { + iph = ip_hdr(skb); + + if (iph->saddr != saddr || + iph->daddr != daddr || + skb->mark != mark || + iph->tos != tos) { + err = ip_route_me_harder(skb, RTN_UNSPEC); + if (err < 0) + ret = NF_DROP_ERR(err); + } + } + + return ret; +} + +/* The work comes in here from netfilter.c. */ +static unsigned int +iptable_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 ipt_mangle_out(skb, state); + if (ops->hooknum == NF_INET_POST_ROUTING) + return ipt_do_table(skb, ops->hooknum, state, + dev_net(state->out)->ipv4.iptable_mangle); + /* PREROUTING/INPUT/FORWARD: */ + return ipt_do_table(skb, ops->hooknum, state, + dev_net(state->in)->ipv4.iptable_mangle); +} + +static struct nf_hook_ops *mangle_ops __read_mostly; + +static int __net_init iptable_mangle_net_init(struct net *net) +{ + struct ipt_replace *repl; + + repl = ipt_alloc_initial_table(&packet_mangler); + if (repl == NULL) + return -ENOMEM; + net->ipv4.iptable_mangle = + ipt_register_table(net, &packet_mangler, repl); + kfree(repl); + return PTR_ERR_OR_ZERO(net->ipv4.iptable_mangle); +} + +static void __net_exit iptable_mangle_net_exit(struct net *net) +{ + ipt_unregister_table(net, net->ipv4.iptable_mangle); +} + +static struct pernet_operations iptable_mangle_net_ops = { + .init = iptable_mangle_net_init, + .exit = iptable_mangle_net_exit, +}; + +static int __init iptable_mangle_init(void) +{ + int ret; + + ret = register_pernet_subsys(&iptable_mangle_net_ops); + if (ret < 0) + return ret; + + /* Register hooks */ + mangle_ops = xt_hook_link(&packet_mangler, iptable_mangle_hook); + if (IS_ERR(mangle_ops)) { + ret = PTR_ERR(mangle_ops); + unregister_pernet_subsys(&iptable_mangle_net_ops); + } + + return ret; +} + +static void __exit iptable_mangle_fini(void) +{ + xt_hook_unlink(&packet_mangler, mangle_ops); + unregister_pernet_subsys(&iptable_mangle_net_ops); +} + +module_init(iptable_mangle_init); +module_exit(iptable_mangle_fini); |