2013-04-06 07:24:29 -06:00
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/*
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* IPv6 specific functions of netfilter core
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*
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* Rusty Russell (C) 2000 -- This code is GPL.
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* Patrick McHardy (C) 2006-2012
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*/
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2005-08-09 20:39:00 -06:00
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#include <linux/kernel.h>
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2006-01-09 17:43:13 -07:00
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#include <linux/init.h>
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2005-08-09 20:39:00 -06:00
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#include <linux/ipv6.h>
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2005-08-09 20:42:34 -06:00
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv6.h>
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2011-07-15 09:47:34 -06:00
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#include <linux/export.h>
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2013-05-16 21:56:10 -06:00
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#include <net/addrconf.h>
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2005-08-09 20:39:00 -06:00
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#include <net/dst.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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2006-01-07 00:04:54 -07:00
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#include <net/xfrm.h>
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2006-04-07 16:00:06 -06:00
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#include <net/ip6_checksum.h>
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2007-12-05 02:24:48 -07:00
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#include <net/netfilter/nf_queue.h>
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2005-08-09 20:39:00 -06:00
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int ip6_route_me_harder(struct sk_buff *skb)
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{
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2009-06-01 23:19:30 -06:00
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struct net *net = dev_net(skb_dst(skb)->dev);
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2011-04-21 22:53:02 -06:00
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const struct ipv6hdr *iph = ipv6_hdr(skb);
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2012-08-26 11:14:08 -06:00
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unsigned int hh_len;
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2005-08-09 20:39:00 -06:00
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struct dst_entry *dst;
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2011-03-12 14:22:43 -07:00
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struct flowi6 fl6 = {
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.flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0,
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.flowi6_mark = skb->mark,
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.daddr = iph->daddr,
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.saddr = iph->saddr,
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2005-08-09 20:39:00 -06:00
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};
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2014-05-08 07:22:35 -06:00
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int err;
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2005-08-09 20:39:00 -06:00
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2011-03-12 14:22:43 -07:00
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dst = ip6_route_output(net, skb->sk, &fl6);
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2014-05-08 07:22:35 -06:00
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err = dst->error;
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if (err) {
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2008-10-14 23:55:21 -06:00
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IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
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2014-11-11 11:59:17 -07:00
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net_dbg_ratelimited("ip6_route_me_harder: No more route\n");
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2005-08-09 20:39:00 -06:00
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dst_release(dst);
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2014-05-08 07:22:35 -06:00
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return err;
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2005-08-09 20:39:00 -06:00
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}
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/* Drop old route. */
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2009-06-01 23:19:30 -06:00
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skb_dst_drop(skb);
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2005-08-09 20:39:00 -06:00
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2009-06-01 23:19:30 -06:00
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skb_dst_set(skb, dst);
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2010-04-15 04:37:18 -06:00
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#ifdef CONFIG_XFRM
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if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
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2011-03-12 14:22:43 -07:00
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xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) {
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2010-04-15 04:37:18 -06:00
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skb_dst_set(skb, NULL);
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2011-03-12 14:22:43 -07:00
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dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), skb->sk, 0);
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2011-03-02 14:27:41 -07:00
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if (IS_ERR(dst))
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2013-04-05 00:41:11 -06:00
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return PTR_ERR(dst);
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2010-04-15 04:37:18 -06:00
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skb_dst_set(skb, dst);
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}
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#endif
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2012-08-26 11:14:08 -06:00
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/* Change in oif may mean change in hh_len. */
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hh_len = skb_dst(skb)->dev->hard_header_len;
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if (skb_headroom(skb) < hh_len &&
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pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)),
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0, GFP_ATOMIC))
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2013-04-05 00:41:11 -06:00
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return -ENOMEM;
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2012-08-26 11:14:08 -06:00
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2005-08-09 20:39:00 -06:00
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return 0;
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}
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EXPORT_SYMBOL(ip6_route_me_harder);
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2005-08-09 20:42:34 -06:00
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/*
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* Extra routing may needed on local out, as the QUEUE target never
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* returns control to the table.
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*/
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struct ip6_rt_info {
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struct in6_addr daddr;
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struct in6_addr saddr;
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2008-11-25 04:18:11 -07:00
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u_int32_t mark;
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2005-08-09 20:42:34 -06:00
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};
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2007-12-05 02:26:33 -07:00
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static void nf_ip6_saveroute(const struct sk_buff *skb,
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struct nf_queue_entry *entry)
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2005-08-09 20:42:34 -06:00
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{
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2007-12-05 02:26:33 -07:00
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struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
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2005-08-09 20:42:34 -06:00
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2007-12-05 02:26:33 -07:00
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if (entry->hook == NF_INET_LOCAL_OUT) {
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2011-04-21 22:53:02 -06:00
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const struct ipv6hdr *iph = ipv6_hdr(skb);
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2005-08-09 20:42:34 -06:00
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rt_info->daddr = iph->daddr;
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rt_info->saddr = iph->saddr;
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2008-11-25 04:18:11 -07:00
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rt_info->mark = skb->mark;
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2005-08-09 20:42:34 -06:00
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}
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}
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2007-12-05 02:26:33 -07:00
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static int nf_ip6_reroute(struct sk_buff *skb,
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const struct nf_queue_entry *entry)
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2005-08-09 20:42:34 -06:00
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{
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2007-12-05 02:26:33 -07:00
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struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
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2005-08-09 20:42:34 -06:00
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2007-12-05 02:26:33 -07:00
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if (entry->hook == NF_INET_LOCAL_OUT) {
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2011-04-21 22:53:02 -06:00
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const struct ipv6hdr *iph = ipv6_hdr(skb);
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2005-08-09 20:42:34 -06:00
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if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
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2008-11-25 04:18:11 -07:00
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!ipv6_addr_equal(&iph->saddr, &rt_info->saddr) ||
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skb->mark != rt_info->mark)
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2007-10-15 01:53:15 -06:00
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return ip6_route_me_harder(skb);
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2005-08-09 20:42:34 -06:00
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}
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return 0;
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}
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2011-04-04 08:56:29 -06:00
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static int nf_ip6_route(struct net *net, struct dst_entry **dst,
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2011-04-04 09:00:54 -06:00
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struct flowi *fl, bool strict)
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2007-12-05 02:22:05 -07:00
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{
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2011-04-04 09:00:54 -06:00
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static const struct ipv6_pinfo fake_pinfo;
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static const struct inet_sock fake_sk = {
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/* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */
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.sk.sk_bound_dev_if = 1,
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.pinet6 = (struct ipv6_pinfo *) &fake_pinfo,
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};
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const void *sk = strict ? &fake_sk : NULL;
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2011-10-19 05:23:06 -06:00
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struct dst_entry *result;
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int err;
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result = ip6_route_output(net, sk, &fl->u.ip6);
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err = result->error;
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if (err)
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dst_release(result);
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else
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*dst = result;
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return err;
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2007-12-05 02:22:05 -07:00
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}
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2006-11-14 22:40:42 -07:00
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__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
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2006-04-06 15:18:43 -06:00
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unsigned int dataoff, u_int8_t protocol)
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{
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2011-04-21 22:53:02 -06:00
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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2006-11-14 22:40:42 -07:00
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__sum16 csum = 0;
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2006-04-06 15:18:43 -06:00
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switch (skb->ip_summed) {
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2006-08-29 17:44:56 -06:00
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case CHECKSUM_COMPLETE:
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2007-11-19 19:53:30 -07:00
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if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN)
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2006-04-06 15:18:43 -06:00
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break;
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if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
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2007-02-09 07:24:49 -07:00
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skb->len - dataoff, protocol,
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2006-04-06 15:18:43 -06:00
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csum_sub(skb->csum,
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skb_checksum(skb, 0,
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dataoff, 0)))) {
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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break;
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}
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/* fall through */
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case CHECKSUM_NONE:
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2006-11-14 22:35:48 -07:00
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skb->csum = ~csum_unfold(
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csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
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2006-04-06 15:18:43 -06:00
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skb->len - dataoff,
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protocol,
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csum_sub(0,
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skb_checksum(skb, 0,
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2007-02-09 07:24:49 -07:00
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dataoff, 0))));
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2006-04-06 15:18:43 -06:00
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csum = __skb_checksum_complete(skb);
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}
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return csum;
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}
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EXPORT_SYMBOL(nf_ip6_checksum);
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2008-03-20 08:15:53 -06:00
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static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook,
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unsigned int dataoff, unsigned int len,
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u_int8_t protocol)
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{
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2011-04-21 22:53:02 -06:00
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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2008-03-20 08:15:53 -06:00
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__wsum hsum;
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__sum16 csum = 0;
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switch (skb->ip_summed) {
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case CHECKSUM_COMPLETE:
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if (len == skb->len - dataoff)
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return nf_ip6_checksum(skb, hook, dataoff, protocol);
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/* fall through */
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case CHECKSUM_NONE:
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hsum = skb_checksum(skb, 0, dataoff, 0);
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skb->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
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&ip6h->daddr,
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skb->len - dataoff,
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protocol,
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csum_sub(0, hsum)));
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skb->ip_summed = CHECKSUM_NONE;
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2010-06-14 08:20:02 -06:00
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return __skb_checksum_complete_head(skb, dataoff + len);
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2008-03-20 08:15:53 -06:00
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}
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return csum;
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};
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2013-05-16 21:56:10 -06:00
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static const struct nf_ipv6_ops ipv6ops = {
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.chk_addr = ipv6_chk_addr,
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};
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2007-12-17 23:42:27 -07:00
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static const struct nf_afinfo nf_ip6_afinfo = {
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2008-03-20 08:15:53 -06:00
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.family = AF_INET6,
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.checksum = nf_ip6_checksum,
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.checksum_partial = nf_ip6_checksum_partial,
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.route = nf_ip6_route,
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.saveroute = nf_ip6_saveroute,
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.reroute = nf_ip6_reroute,
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.route_key_size = sizeof(struct ip6_rt_info),
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2005-08-09 20:42:34 -06:00
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};
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int __init ipv6_netfilter_init(void)
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{
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2013-05-16 21:56:10 -06:00
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RCU_INIT_POINTER(nf_ipv6_ops, &ipv6ops);
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2006-04-06 15:18:09 -06:00
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return nf_register_afinfo(&nf_ip6_afinfo);
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2005-08-09 20:42:34 -06:00
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}
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2006-01-10 22:02:21 -07:00
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/* This can be called from inet6_init() on errors, so it cannot
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* be marked __exit. -DaveM
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*/
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void ipv6_netfilter_fini(void)
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2005-08-09 20:42:34 -06:00
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{
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2013-05-16 21:56:10 -06:00
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RCU_INIT_POINTER(nf_ipv6_ops, NULL);
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2006-04-06 15:18:09 -06:00
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nf_unregister_afinfo(&nf_ip6_afinfo);
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2005-08-09 20:42:34 -06:00
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}
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