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[NETFILTER]: Fix xfrm lookup in ip_route_me_harder/ip6_route_me_harder 

ip_route_me_harder doesn't use the port numbers of the xfrm lookup and
uses ip_route_input for non-local addresses which doesn't do a xfrm
lookup, ip6_route_me_harder doesn't do a xfrm lookup at all.

Use xfrm_decode_session and do the lookup manually, make sure both
only do the lookup if the packet hasn't been transformed already.

Makeing sure the lookup only happens once needs a new field in the
IP6CB, which exceeds the size of skb->cb. The size of skb->cb is
increased to 48b. Apparently the IPv6 mobile extensions need some
more room anyway.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-01-06 23:04:54 -08:00 committed by David S. Miller
parent 8cdfab8a43
commit 3e3850e989
11 changed files with 34 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/ipv6.h
View File

@ -192,6 +192,9 @@ struct inet6_skb_parm {
__u16 dst1;
__u16 lastopt;
__u32 nhoff;
__u16 flags;
#define IP6SKB_XFRM_TRANSFORMED 1
};
#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))

2
include/linux/skbuff.h
View File

@ -251,7 +251,7 @@ struct sk_buff {
* want to keep them across layers you have to do a skb_clone()
* first. This is owned by whoever has the skb queued ATM.
*/
char cb[40];
char cb[48];
unsigned int len,
data_len,

3
include/net/ip.h
View File

@ -39,7 +39,8 @@ struct inet_skb_parm
#define IPSKB_FORWARDED 1
#define IPSKB_XFRM_TUNNEL_SIZE 2
#define IPSKB_FRAG_COMPLETE 4
#define IPSKB_XFRM_TRANSFORMED 4
#define IPSKB_FRAG_COMPLETE 8
};
struct ipcm_cookie

2
include/net/xfrm.h
View File

@ -668,7 +668,7 @@ static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *s
return xfrm_policy_check(sk, dir, skb, AF_INET6);
}
extern int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family);
extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)

2
net/ipv4/ip_gre.c
View File

@ -832,7 +832,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
skb->h.raw = skb->nh.raw;
skb->nh.raw = skb_push(skb, gre_hlen);
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
IPCB(skb)->flags &= ~IPSKB_XFRM_TUNNEL_SIZE;
IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE|IPSKB_XFRM_TRANSFORMED);
dst_release(skb->dst);
skb->dst = &rt->u.dst;

2
net/ipv4/ipip.c
View File

@ -621,7 +621,7 @@ static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
skb->h.raw = skb->nh.raw;
skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
IPCB(skb)->flags &= ~IPSKB_XFRM_TUNNEL_SIZE;
IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE|IPSKB_XFRM_TRANSFORMED);
dst_release(skb->dst);
skb->dst = &rt->u.dst;

12
net/ipv4/netfilter.c
View File

@ -7,11 +7,13 @@
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/icmp.h>
#include <net/route.h>
#include <linux/ip.h>
#include <net/xfrm.h>
#include <net/ip.h>
/* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
int ip_route_me_harder(struct sk_buff **pskb)
@ -33,7 +35,6 @@ int ip_route_me_harder(struct sk_buff **pskb)
#ifdef CONFIG_IP_ROUTE_FWMARK
fl.nl_u.ip4_u.fwmark = (*pskb)->nfmark;
#endif
fl.proto = iph->protocol;
if (ip_route_output_key(&rt, &fl) != 0)
return -1;
@ -60,6 +61,13 @@ int ip_route_me_harder(struct sk_buff **pskb)
if ((*pskb)->dst->error)
return -1;
#ifdef CONFIG_XFRM
if (!(IPCB(*pskb)->flags & IPSKB_XFRM_TRANSFORMED) &&
xfrm_decode_session(*pskb, &fl, AF_INET) == 0)
if (xfrm_lookup(&(*pskb)->dst, &fl, (*pskb)->sk, 0))
return -1;
#endif
/* Change in oif may mean change in hh_len. */
hh_len = (*pskb)->dst->dev->hard_header_len;
if (skb_headroom(*pskb) < hh_len) {

1
net/ipv4/xfrm4_output.c
View File

@ -140,6 +140,7 @@ static int xfrm4_output_one(struct sk_buff *skb)
x = dst->xfrm;
} while (x && !x->props.mode);
IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
err = 0;
out_exit:

9
net/ipv6/netfilter.c
View File

@ -10,6 +10,7 @@
#include <net/dst.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/xfrm.h>
int ip6_route_me_harder(struct sk_buff *skb)
{
@ -21,11 +22,17 @@ int ip6_route_me_harder(struct sk_buff *skb)
{ .ip6_u =
{ .daddr = iph->daddr,
.saddr = iph->saddr, } },
.proto = iph->nexthdr,
};
dst = ip6_route_output(skb->sk, &fl);
#ifdef CONFIG_XFRM
if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
xfrm_decode_session(skb, &fl, AF_INET6) == 0)
if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
return -1;
#endif
if (dst->error) {
IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");

1
net/ipv6/xfrm6_output.c
View File

@ -139,6 +139,7 @@ static int xfrm6_output_one(struct sk_buff *skb)
x = dst->xfrm;
} while (x && !x->props.mode);
IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
err = 0;
out_exit:

9
net/xfrm/xfrm_policy.c
View File

@ -951,8 +951,8 @@ xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
return start;
}
static int
_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
int
xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
{
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
@ -963,6 +963,7 @@ _decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
xfrm_policy_put_afinfo(afinfo);
return 0;
}
EXPORT_SYMBOL(xfrm_decode_session);
static inline int secpath_has_tunnel(struct sec_path *sp, int k)
{
@ -982,7 +983,7 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
u8 fl_dir = policy_to_flow_dir(dir);
u32 sk_sid;
if (_decode_session(skb, &fl, family) < 0)
if (xfrm_decode_session(skb, &fl, family) < 0)
return 0;
sk_sid = security_sk_sid(sk, &fl, fl_dir);
@ -1055,7 +1056,7 @@ int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
{
struct flowi fl;
if (_decode_session(skb, &fl, family) < 0)
if (xfrm_decode_session(skb, &fl, family) < 0)
return 0;
return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;