diff options
author | Jan Engelhardt <jengelh@medozas.de> | 2010-04-19 14:17:47 +0200 |
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committer | Patrick McHardy <kaber@trash.net> | 2010-04-19 14:17:47 +0200 |
commit | e281b19897dc21c1071802808d461627d747a877 (patch) | |
tree | e779b58643237f00305b016d6749825d7b3426f8 /net/netfilter/xt_TEE.c | |
parent | f0d57a54aa9fdf3a4d9435d44c69b20388ad0b3b (diff) | |
download | op-kernel-dev-e281b19897dc21c1071802808d461627d747a877.zip op-kernel-dev-e281b19897dc21c1071802808d461627d747a877.tar.gz |
netfilter: xtables: inclusion of xt_TEE
xt_TEE can be used to clone and reroute a packet. This can for
example be used to copy traffic at a router for logging purposes
to another dedicated machine.
References: http://www.gossamer-threads.com/lists/iptables/devel/68781
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/netfilter/xt_TEE.c')
-rw-r--r-- | net/netfilter/xt_TEE.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/net/netfilter/xt_TEE.c b/net/netfilter/xt_TEE.c new file mode 100644 index 0000000..b3d7301 --- /dev/null +++ b/net/netfilter/xt_TEE.c @@ -0,0 +1,256 @@ +/* + * "TEE" target extension for Xtables + * Copyright © Sebastian Claßen, 2007 + * Jan Engelhardt, 2007-2010 + * + * based on ipt_ROUTE.c from Cédric de Launois + * <delaunois@info.ucl.be> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 or later, as published by the Free Software Foundation. + */ +#include <linux/ip.h> +#include <linux/module.h> +#include <linux/route.h> +#include <linux/skbuff.h> +#include <net/checksum.h> +#include <net/icmp.h> +#include <net/ip.h> +#include <net/ipv6.h> +#include <net/ip6_route.h> +#include <net/route.h> +#include <linux/netfilter/x_tables.h> +#include <linux/netfilter/xt_TEE.h> + +#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) +# define WITH_CONNTRACK 1 +# include <net/netfilter/nf_conntrack.h> +#endif +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) +# define WITH_IPV6 1 +#endif + +static const union nf_inet_addr tee_zero_address; + +static struct net *pick_net(struct sk_buff *skb) +{ +#ifdef CONFIG_NET_NS + const struct dst_entry *dst; + + if (skb->dev != NULL) + return dev_net(skb->dev); + dst = skb_dst(skb); + if (dst != NULL && dst->dev != NULL) + return dev_net(dst->dev); +#endif + return &init_net; +} + +static bool tee_tg_route_oif(struct flowi *f, struct net *net, + const struct xt_tee_tginfo *info) +{ + const struct net_device *dev; + + if (*info->oif != '\0') + return true; + dev = dev_get_by_name(net, info->oif); + if (dev == NULL) + return false; + f->oif = dev->ifindex; + return true; +} + +static bool +tee_tg_route4(struct sk_buff *skb, const struct xt_tee_tginfo *info) +{ + const struct iphdr *iph = ip_hdr(skb); + struct net *net = pick_net(skb); + struct rtable *rt; + struct flowi fl; + + memset(&fl, 0, sizeof(fl)); + if (!tee_tg_route_oif(&fl, net, info)) + return false; + fl.nl_u.ip4_u.daddr = info->gw.ip; + fl.nl_u.ip4_u.tos = RT_TOS(iph->tos); + fl.nl_u.ip4_u.scope = RT_SCOPE_UNIVERSE; + if (ip_route_output_key(net, &rt, &fl) != 0) + return false; + + dst_release(skb_dst(skb)); + skb_dst_set(skb, &rt->u.dst); + skb->dev = rt->u.dst.dev; + skb->protocol = htons(ETH_P_IP); + return true; +} + +static unsigned int +tee_tg4(struct sk_buff *skb, const struct xt_target_param *par) +{ + const struct xt_tee_tginfo *info = par->targinfo; + struct iphdr *iph; + + /* + * Copy the skb, and route the copy. Will later return %XT_CONTINUE for + * the original skb, which should continue on its way as if nothing has + * happened. The copy should be independently delivered to the TEE + * --gateway. + */ + skb = pskb_copy(skb, GFP_ATOMIC); + if (skb == NULL) + return XT_CONTINUE; + +#ifdef WITH_CONNTRACK + /* Avoid counting cloned packets towards the original connection. */ + nf_conntrack_put(skb->nfct); + skb->nfct = &nf_conntrack_untracked.ct_general; + skb->nfctinfo = IP_CT_NEW; + nf_conntrack_get(skb->nfct); +#endif + /* + * If we are in PREROUTING/INPUT, the checksum must be recalculated + * since the length could have changed as a result of defragmentation. + * + * We also decrease the TTL to mitigate potential TEE loops + * between two hosts. + * + * Set %IP_DF so that the original source is notified of a potentially + * decreased MTU on the clone route. IPv6 does this too. + */ + iph = ip_hdr(skb); + iph->frag_off |= htons(IP_DF); + if (par->hooknum == NF_INET_PRE_ROUTING || + par->hooknum == NF_INET_LOCAL_IN) + --iph->ttl; + ip_send_check(iph); + + /* + * Xtables is not reentrant currently, so a choice has to be made: + * 1. return absolute verdict for the original and let the cloned + * packet travel through the chains + * 2. let the original continue travelling and not pass the clone + * to Xtables. + * #2 is chosen. Normally, we would use ip_local_out for the clone. + * Because iph->check is already correct and we don't pass it to + * Xtables anyway, a shortcut to dst_output [forwards to ip_output] can + * be taken. %IPSKB_REROUTED needs to be set so that ip_output does not + * invoke POSTROUTING on the cloned packet. + */ + IPCB(skb)->flags |= IPSKB_REROUTED; + if (tee_tg_route4(skb, info)) + ip_output(skb); + else + kfree_skb(skb); + + return XT_CONTINUE; +} + +#ifdef WITH_IPV6 +static bool +tee_tg_route6(struct sk_buff *skb, const struct xt_tee_tginfo *info) +{ + const struct ipv6hdr *iph = ipv6_hdr(skb); + struct net *net = pick_net(skb); + struct dst_entry *dst; + struct flowi fl; + + memset(&fl, 0, sizeof(fl)); + if (!tee_tg_route_oif(&fl, net, info)) + return false; + fl.nl_u.ip6_u.daddr = info->gw.in6; + fl.nl_u.ip6_u.flowlabel = ((iph->flow_lbl[0] & 0xF) << 16) | + (iph->flow_lbl[1] << 8) | iph->flow_lbl[2]; + dst = ip6_route_output(net, NULL, &fl); + if (dst == NULL) + return false; + + dst_release(skb_dst(skb)); + skb_dst_set(skb, dst); + skb->dev = dst->dev; + skb->protocol = htons(ETH_P_IPV6); + return true; +} + +static unsigned int +tee_tg6(struct sk_buff *skb, const struct xt_target_param *par) +{ + const struct xt_tee_tginfo *info = par->targinfo; + + skb = pskb_copy(skb, GFP_ATOMIC); + if (skb == NULL) + return XT_CONTINUE; + +#ifdef WITH_CONNTRACK + nf_conntrack_put(skb->nfct); + skb->nfct = &nf_conntrack_untracked.ct_general; + skb->nfctinfo = IP_CT_NEW; + nf_conntrack_get(skb->nfct); +#endif + if (par->hooknum == NF_INET_PRE_ROUTING || + par->hooknum == NF_INET_LOCAL_IN) { + struct ipv6hdr *iph = ipv6_hdr(skb); + --iph->hop_limit; + } + IP6CB(skb)->flags |= IP6SKB_REROUTED; + if (tee_tg_route6(skb, info)) + ip6_output(skb); + else + kfree_skb(skb); + + return XT_CONTINUE; +} +#endif /* WITH_IPV6 */ + +static int tee_tg_check(const struct xt_tgchk_param *par) +{ + const struct xt_tee_tginfo *info = par->targinfo; + + if (info->oif[sizeof(info->oif)-1] != '\0') + return -EINVAL; + /* 0.0.0.0 and :: not allowed */ + return (memcmp(&info->gw, &tee_zero_address, + sizeof(tee_zero_address)) == 0) ? -EINVAL : 0; +} + +static struct xt_target tee_tg_reg[] __read_mostly = { + { + .name = "TEE", + .revision = 1, + .family = NFPROTO_IPV4, + .target = tee_tg4, + .targetsize = sizeof(struct xt_tee_tginfo), + .checkentry = tee_tg_check, + .me = THIS_MODULE, + }, +#ifdef WITH_IPV6 + { + .name = "TEE", + .revision = 1, + .family = NFPROTO_IPV6, + .target = tee_tg6, + .targetsize = sizeof(struct xt_tee_tginfo), + .checkentry = tee_tg_check, + .me = THIS_MODULE, + }, +#endif +}; + +static int __init tee_tg_init(void) +{ + return xt_register_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg)); +} + +static void __exit tee_tg_exit(void) +{ + xt_unregister_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg)); +} + +module_init(tee_tg_init); +module_exit(tee_tg_exit); +MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>"); +MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); +MODULE_DESCRIPTION("Xtables: Reroute packet copy"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("ipt_TEE"); +MODULE_ALIAS("ip6t_TEE"); |